diff --git a/src/battle-phases.ts b/src/battle-phases.ts
index 12bc9e79e..0d9d87e85 100644
--- a/src/battle-phases.ts
+++ b/src/battle-phases.ts
@@ -260,7 +260,7 @@ export abstract class FieldPhase extends BattlePhase {
       const aSpeed = a?.getBattleStat(Stat.SPD) || 0;
       const bSpeed = b?.getBattleStat(Stat.SPD) || 0;
 
-      return aSpeed < bSpeed ? 1 : aSpeed > bSpeed ? -1 : !Utils.randInt(2) ? -1 : 1;
+      return aSpeed < bSpeed ? 1 : aSpeed > bSpeed ? -1 : !this.scene.currentBattle.randSeedInt(2) ? -1 : 1;
     });
 
     const speedReversed = new Utils.BooleanHolder(false);
@@ -1692,7 +1692,7 @@ export class MovePhase extends BattlePhase {
       
       switch (this.pokemon.status.effect) {
         case StatusEffect.PARALYSIS:
-          if (Utils.randInt(4) === 0) {
+          if (!this.pokemon.randSeedInt(4)) {
             activated = true;
             this.cancelled = true;
           }
@@ -1704,7 +1704,7 @@ export class MovePhase extends BattlePhase {
           this.cancelled = activated;
           break;
         case StatusEffect.FREEZE:
-          healed = Utils.randInt(5) === 0;
+          healed = !this.pokemon.randSeedInt(5);
           activated = !healed;
           this.cancelled = activated;
           break;
@@ -1919,7 +1919,7 @@ export class MoveEffectPhase extends PokemonPhase {
     applyAbAttrs(IgnoreOpponentStatChangesAbAttr, target, null, userAccuracyLevel);
     applyAbAttrs(IgnoreOpponentStatChangesAbAttr, this.getUserPokemon(), null, targetEvasionLevel);
     this.scene.applyModifiers(TempBattleStatBoosterModifier, this.player, TempBattleStat.ACC, userAccuracyLevel);
-    const rand = Utils.randInt(100, 1);
+    const rand = this.getUserPokemon().randSeedInt(100, 1);
     let accuracyMultiplier = 1;
     if (userAccuracyLevel.value !== targetEvasionLevel.value) {
       accuracyMultiplier = userAccuracyLevel.value > targetEvasionLevel.value
@@ -2020,9 +2020,8 @@ export class StatChangePhase extends PokemonPhase {
   constructor(scene: BattleScene, battlerIndex: BattlerIndex, selfTarget: boolean, stats: BattleStat[], levels: integer) {
     super(scene, battlerIndex);
 
-    const allStats = Utils.getEnumValues(BattleStat);
     this.selfTarget = selfTarget;
-    this.stats = stats.map(s => s !== BattleStat.RAND ? s : allStats[Utils.randInt(BattleStat.SPD + 1)]);
+    this.stats = stats;
     this.levels = levels;
   }
 
@@ -2032,7 +2031,8 @@ export class StatChangePhase extends PokemonPhase {
     if (pokemon.isFainted())
       return this.end();
 
-    const filteredStats = this.stats.filter(stat => {
+    const allStats = Utils.getEnumValues(BattleStat);
+    const filteredStats = this.stats.map(s => s !== BattleStat.RAND ? s : allStats[pokemon.randSeedInt(BattleStat.SPD + 1)]).filter(stat => {
       const cancelled = new Utils.BooleanHolder(false);
 
       if (!this.selfTarget && this.levels < 0)
@@ -3046,7 +3046,7 @@ export class AttemptCapturePhase extends PokemonPhase {
                     shakeCounter.stop();
                     this.failCatch(shakeCount);
                   } else if (shakeCount++ < 3) {
-                    if (Utils.randInt(65536) < y)
+                    if (pokemon.randSeedInt(65536) < y)
                       this.scene.playSound('pb_move');
                     else {
                       shakeCounter.stop();
@@ -3190,7 +3190,7 @@ export class AttemptRunPhase extends PokemonPhase {
     const escapeChance = new Utils.IntegerHolder((((playerPokemon.getStat(Stat.SPD) * 128) / enemySpeed) + (30 * this.scene.currentBattle.escapeAttempts++)) % 256);
     applyAbAttrs(RunSuccessAbAttr, playerPokemon, null, escapeChance);
 
-    if (Utils.randInt(256) < escapeChance.value) {
+    if (playerPokemon.randSeedInt(256) < escapeChance.value) {
       this.scene.playSound('flee');
       this.scene.queueMessage('You got away safely!', null, true, 500);
       
diff --git a/src/battle.ts b/src/battle.ts
index 7f8f50a8f..964d9bf8e 100644
--- a/src/battle.ts
+++ b/src/battle.ts
@@ -48,6 +48,8 @@ export default class Battle {
     public playerParticipantIds: Set<integer> = new Set<integer>();
     public escapeAttempts: integer = 0;
     public lastMove: Moves;
+    public battleSeed: string;
+    private battleSeedState: string;
 
     constructor(waveIndex: integer, battleType: BattleType, trainer: Trainer, double: boolean) {
         this.waveIndex = waveIndex;
@@ -61,6 +63,8 @@ export default class Battle {
         this.double = double;
         this.turn = 0;
         this.started = false;
+        this.battleSeed = Utils.randomString(16, true);
+        this.battleSeedState = null;
     }
 
     private getLevelForWave(): integer {
@@ -86,6 +90,7 @@ export default class Battle {
     incrementTurn(scene: BattleScene): void {
         this.turn++;
         this.turnCommands = Object.fromEntries(Utils.getEnumValues(BattlerIndex).map(bt => [ bt, null ]));
+        this.battleSeedState = null;
     }
 
     addParticipant(playerPokemon: PlayerPokemon): void {
@@ -120,6 +125,19 @@ export default class Battle {
 
         return null;
     }
+
+    randSeedInt(range: integer, min: integer = 0): integer {
+        let ret: integer;
+        const state = Phaser.Math.RND.state();
+        if (this.battleSeedState)
+            Phaser.Math.RND.state(this.battleSeedState);
+        else
+            Phaser.Math.RND.sow([ Utils.shiftCharCodes(this.battleSeed, this.turn << 6) ]);
+        ret = Utils.randSeedInt(range, min);
+        this.battleSeedState = Phaser.Math.RND.state();
+        Phaser.Math.RND.state(state);
+        return ret;
+    }
 }
 
 export class FixedBattle extends Battle {
diff --git a/src/data/ability.ts b/src/data/ability.ts
index 716e80923..265297093 100644
--- a/src/data/ability.ts
+++ b/src/data/ability.ts
@@ -347,8 +347,8 @@ export class PostDefendContactApplyStatusEffectAbAttr extends PostDefendAbAttr {
   }
 
   applyPostDefend(pokemon: Pokemon, attacker: Pokemon, move: PokemonMove, hitResult: HitResult, args: any[]): boolean {
-    if (move.getMove().checkFlag(MoveFlags.MAKES_CONTACT, attacker, pokemon) && Utils.randInt(100) < this.chance && !pokemon.status) {
-      const effect = this.effects.length === 1 ? this.effects[0] : this.effects[Utils.randInt(this.effects.length)];
+    if (move.getMove().checkFlag(MoveFlags.MAKES_CONTACT, attacker, pokemon) && pokemon.randSeedInt(100) < this.chance && !pokemon.status) {
+      const effect = this.effects.length === 1 ? this.effects[0] : this.effects[pokemon.randSeedInt(this.effects.length)];
       pokemon.scene.unshiftPhase(new ObtainStatusEffectPhase(pokemon.scene, attacker.getBattlerIndex(), effect));
     }
 
@@ -370,7 +370,7 @@ export class PostDefendContactApplyTagChanceAbAttr extends PostDefendAbAttr {
   }
 
   applyPostDefend(pokemon: Pokemon, attacker: Pokemon, move: PokemonMove, hitResult: HitResult, args: any[]): boolean {
-    if (move.getMove().checkFlag(MoveFlags.MAKES_CONTACT, attacker, pokemon) && Utils.randInt(100) < this.chance)
+    if (move.getMove().checkFlag(MoveFlags.MAKES_CONTACT, attacker, pokemon) && pokemon.randSeedInt(100) < this.chance)
       return attacker.addTag(this.tagType, this.turnCount, move.moveId, pokemon.id);
 
     return false;
@@ -490,7 +490,7 @@ export class PostAttackStealHeldItemAbAttr extends PostAttackAbAttr {
       if (hitResult < HitResult.NO_EFFECT && (!this.condition || this.condition(pokemon, defender, move.getMove()))) {
         const heldItems = this.getTargetHeldItems(defender).filter(i => i.getTransferrable(false));
         if (heldItems.length) {
-          const stolenItem = heldItems[Utils.randInt(heldItems.length)];
+          const stolenItem = heldItems[pokemon.randSeedInt(heldItems.length)];
           pokemon.scene.tryTransferHeldItemModifier(stolenItem, pokemon, false, false).then(success => {
             if (success)
               pokemon.scene.queueMessage(getPokemonMessage(pokemon, ` stole\n${defender.name}'s ${stolenItem.type.name}!`));
@@ -523,7 +523,7 @@ export class PostDefendStealHeldItemAbAttr extends PostDefendAbAttr {
       if (hitResult < HitResult.NO_EFFECT && (!this.condition || this.condition(pokemon, attacker, move.getMove()))) {
         const heldItems = this.getTargetHeldItems(attacker).filter(i => i.getTransferrable(false));
         if (heldItems.length) {
-          const stolenItem = heldItems[Utils.randInt(heldItems.length)];
+          const stolenItem = heldItems[pokemon.randSeedInt(heldItems.length)];
           pokemon.scene.tryTransferHeldItemModifier(stolenItem, pokemon, false, false).then(success => {
             if (success)
               pokemon.scene.queueMessage(getPokemonMessage(pokemon, ` stole\n${attacker.name}'s ${stolenItem.type.name}!`));
diff --git a/src/data/battler-tag.ts b/src/data/battler-tag.ts
index 76e7cea01..4c64b71eb 100644
--- a/src/data/battler-tag.ts
+++ b/src/data/battler-tag.ts
@@ -202,10 +202,10 @@ export class ConfusedTag extends BattlerTag {
       pokemon.scene.queueMessage(getPokemonMessage(pokemon, ' is\nconfused!'));
       pokemon.scene.unshiftPhase(new CommonAnimPhase(pokemon.scene, pokemon.getBattlerIndex(), undefined, CommonAnim.CONFUSION));
 
-      if (Utils.randInt(2)) {
+      if (pokemon.randSeedInt(2)) {
         const atk = pokemon.getBattleStat(Stat.ATK);
         const def = pokemon.getBattleStat(Stat.DEF);
-        const damage = Math.ceil(((((2 * pokemon.level / 5 + 2) * 40 * atk / def) / 50) + 2) * (Utils.randInt(15, 85) / 100));
+        const damage = Math.ceil(((((2 * pokemon.level / 5 + 2) * 40 * atk / def) / 50) + 2) * (pokemon.randSeedInt(15, 85) / 100));
         pokemon.scene.queueMessage('It hurt itself in its\nconfusion!');
         pokemon.scene.unshiftPhase(new DamagePhase(pokemon.scene, pokemon.getBattlerIndex()));
         pokemon.damage(damage);
@@ -250,7 +250,7 @@ export class InfatuatedTag extends BattlerTag {
       pokemon.scene.queueMessage(getPokemonMessage(pokemon, ` is in love\nwith ${pokemon.scene.getPokemonById(this.sourceId).name}!`));
       pokemon.scene.unshiftPhase(new CommonAnimPhase(pokemon.scene, pokemon.getBattlerIndex(), undefined, CommonAnim.ATTRACT));
 
-      if (Utils.randInt(2)) {
+      if (pokemon.randSeedInt(2)) {
         pokemon.scene.queueMessage(getPokemonMessage(pokemon, ' is\nimmobilized by love!'));
         (pokemon.scene.getCurrentPhase() as MovePhase).cancel();
       }
@@ -347,7 +347,7 @@ export class FrenzyTag extends BattlerTag {
   onRemove(pokemon: Pokemon): void {
     super.onRemove(pokemon);
 
-    pokemon.addTag(BattlerTagType.CONFUSED, Utils.randIntRange(1, 4) + 1);
+    pokemon.addTag(BattlerTagType.CONFUSED, pokemon.randSeedIntRange(2, 4));
   }
 }
 
diff --git a/src/data/move.ts b/src/data/move.ts
index d0ad8c352..684ee0e1a 100644
--- a/src/data/move.ts
+++ b/src/data/move.ts
@@ -1409,7 +1409,7 @@ export class RandomLevelDamageAttr extends FixedDamageAttr {
   }
 
   getDamage(user: Pokemon, target: Pokemon, move: Move): number {
-    return Math.max(Math.floor(user.level * (Utils.randIntRange(50, 150) * 0.01)), 1);
+    return Math.max(Math.floor(user.level * (user.randSeedIntRange(50, 150) * 0.01)), 1);
   }
 }
 
@@ -1584,7 +1584,7 @@ export class MultiHitAttr extends MoveAttr {
     switch (this.multiHitType) {
       case MultiHitType._2_TO_5:
         {
-          const rand = Utils.randInt(16);
+          const rand = user.randSeedInt(16);
           const hitValue = new Utils.IntegerHolder(rand);
           applyAbAttrs(MaxMultiHitAbAttr, user, null, hitValue);
           if (hitValue.value >= 10)
@@ -1609,7 +1609,7 @@ export class MultiHitAttr extends MoveAttr {
         break;
       case MultiHitType._1_TO_10:
         {
-          const rand = Utils.randInt(90);
+          const rand = user.randSeedInt(90);
           const hitValue = new Utils.IntegerHolder(rand);
           applyAbAttrs(MaxMultiHitAbAttr, user, null, hitValue);
           if (hitValue.value >= 81)
@@ -1658,7 +1658,7 @@ export class StatusEffectAttr extends MoveEffectAttr {
   }
 
   apply(user: Pokemon, target: Pokemon, move: Move, args: any[]): boolean {
-    const statusCheck = move.chance < 0 || move.chance === 100 || Utils.randInt(100) < move.chance;
+    const statusCheck = move.chance < 0 || move.chance === 100 || user.randSeedInt(100) < move.chance;
     if (statusCheck) {
       const pokemon = this.selfTarget ? user : target;
       if (pokemon.status) {
@@ -1689,7 +1689,7 @@ export class StealHeldItemAttr extends MoveEffectAttr {
     return new Promise<boolean>(resolve => {
       const heldItems = this.getTargetHeldItems(target).filter(i => i.getTransferrable(false));
       if (heldItems.length) {
-        const stolenItem = heldItems[Utils.randInt(heldItems.length)];
+        const stolenItem = heldItems[user.randSeedInt(heldItems.length)];
         user.scene.tryTransferHeldItemModifier(stolenItem, user, false, false).then(success => {
           if (success)
             user.scene.queueMessage(getPokemonMessage(user, ` stole\n${target.name}'s ${stolenItem.type.name}!`));
@@ -1933,7 +1933,7 @@ export class StatChangeAttr extends MoveEffectAttr {
     if (!super.apply(user, target, move, args) || (this.condition && !this.condition(user, target, move)))
       return false;
 
-    if (move.chance < 0 || move.chance === 100 || Utils.randInt(100) < move.chance) {
+    if (move.chance < 0 || move.chance === 100 || user.randSeedInt(100) < move.chance) {
       const levels = this.getLevels(user);
       user.scene.unshiftPhase(new StatChangePhase(user.scene, (this.selfTarget ? user : target).getBattlerIndex(), this.selfTarget, this.stats, levels));
       return true;
@@ -2321,7 +2321,7 @@ export class FrenzyAttr extends MoveEffectAttr {
 
     if (!user.getMoveQueue().length) {
       if (!user.getTag(BattlerTagType.FRENZY)) {
-        const turnCount = Utils.randIntRange(3, 4);
+        const turnCount = user.randSeedIntRange(2, 3);
         new Array(turnCount).fill(null).map(() => user.getMoveQueue().push({ move: move.id, targets: [ target.getBattlerIndex() ], ignorePP: true }));
         user.addTag(BattlerTagType.FRENZY, 1, move.id, user.id);
       } else {
@@ -2345,14 +2345,16 @@ export const frenzyMissFunc: UserMoveCondition = (user: Pokemon, move: Move) =>
 
 export class AddBattlerTagAttr extends MoveEffectAttr {
   public tagType: BattlerTagType;
-  public turnCount: integer;
+  public turnCountMin: integer;
+  public turnCountMax: integer;
   private failOnOverlap: boolean;
 
-  constructor(tagType: BattlerTagType, selfTarget?: boolean, turnCount?: integer, failOnOverlap?: boolean) {
+  constructor(tagType: BattlerTagType, selfTarget: boolean = false, failOnOverlap: boolean = false, turnCountMin: integer = 0, turnCountMax?: integer) {
     super(selfTarget);
 
     this.tagType = tagType;
-    this.turnCount = turnCount;
+    this.turnCountMin = turnCountMin;
+    this.turnCountMax = turnCountMax !== undefined ? turnCountMax : turnCountMin;
     this.failOnOverlap = !!failOnOverlap;
   }
 
@@ -2361,8 +2363,8 @@ export class AddBattlerTagAttr extends MoveEffectAttr {
       return false;
 
     const chance = this.getTagChance(user, target, move);
-    if (chance < 0 || chance === 100 || Utils.randInt(100) < chance) {
-      (this.selfTarget ? user : target).addTag(this.tagType, this.turnCount, move.id, user.id);
+    if (chance < 0 || chance === 100 || user.randSeedInt(100) < chance) {
+      (this.selfTarget ? user : target).addTag(this.tagType,  user.randSeedInt(this.turnCountMax - this.turnCountMin, this.turnCountMin), move.id, user.id);
       return true;
     }
 
@@ -2454,13 +2456,13 @@ export class FlinchAttr extends AddBattlerTagAttr {
 
 export class ConfuseAttr extends AddBattlerTagAttr {
   constructor(selfTarget?: boolean) {
-    super(BattlerTagType.CONFUSED, selfTarget, Utils.randIntRange(1, 4) + 1);
+    super(BattlerTagType.CONFUSED, selfTarget, false, 2, 5);
   }
 }
 
 export class TrapAttr extends AddBattlerTagAttr {
   constructor(tagType: BattlerTagType) {
-    super(tagType, false, Utils.randIntRange(2, 5) + 1);
+    super(tagType, false, false, 3, 6);
   }
 }
 
@@ -2472,12 +2474,12 @@ export class ProtectAttr extends AddBattlerTagAttr {
   getCondition(): MoveCondition {
     return ((user, target, move): boolean => {
       let timesUsed = 0;
-      const moveHistory = user.getLastXMoves(-1);
+      const moveHistory = user.getLastXMoves();
       let turnMove: TurnMove;
       while (moveHistory.length && (turnMove = moveHistory.shift()).move === move.id && turnMove.result === MoveResult.SUCCESS)
         timesUsed++;
       if (timesUsed)
-        return !Utils.randInt(Math.pow(2, timesUsed));
+        return !user.randSeedInt(Math.pow(2, timesUsed));
       return true;
     });
   }
@@ -2485,7 +2487,7 @@ export class ProtectAttr extends AddBattlerTagAttr {
 
 export class IgnoreAccuracyAttr extends AddBattlerTagAttr {
   constructor() {
-    super(BattlerTagType.IGNORE_ACCURACY, true, 1);
+    super(BattlerTagType.IGNORE_ACCURACY, true, false, 1);
   }
 
   apply(user: Pokemon, target: Pokemon, move: Move, args: any[]): boolean {
@@ -2500,14 +2502,14 @@ export class IgnoreAccuracyAttr extends AddBattlerTagAttr {
 
 export class FaintCountdownAttr extends AddBattlerTagAttr {
   constructor() {
-    super(BattlerTagType.PERISH_SONG, false, 4, true);
+    super(BattlerTagType.PERISH_SONG, false, true, 4);
   }
 
   apply(user: Pokemon, target: Pokemon, move: Move, args: any[]): boolean {
     if (!super.apply(user, target, move, args))
       return false;
 
-    user.scene.queueMessage(getPokemonMessage(target, `\nwill faint in ${this.turnCount - 1} turns.`));
+    user.scene.queueMessage(getPokemonMessage(target, `\nwill faint in ${this.turnCountMin - 1} turns.`));
 
     return true;
   }
@@ -2548,7 +2550,7 @@ export class AddArenaTagAttr extends MoveEffectAttr {
     if (!super.apply(user, target, move, args))
       return false;
 
-    if (move.chance < 0 || move.chance === 100 || Utils.randInt(100) < move.chance) {
+    if (move.chance < 0 || move.chance === 100 || user.randSeedInt(100) < move.chance) {
       user.scene.arena.addTag(this.tagType, this.turnCount, move.id, user.id);
       return true;
     }
@@ -2689,7 +2691,7 @@ export class RandomMovesetMoveAttr extends OverrideMoveEffectAttr {
     const moveset = (!this.enemyMoveset ? user : target).getMoveset();
     const moves = moveset.filter(m => !m.getMove().hasFlag(MoveFlags.IGNORE_VIRTUAL));
     if (moves.length) {
-      const move = moves[Utils.randInt(moves.length)];
+      const move = moves[user.randSeedInt(moves.length)];
       const moveIndex = moveset.findIndex(m => m.moveId === move.moveId);
       const moveTargets = getMoveTargets(user, move.moveId);
       if (!moveTargets.targets.length)
@@ -2698,7 +2700,7 @@ export class RandomMovesetMoveAttr extends OverrideMoveEffectAttr {
         ? moveTargets.targets
         : moveTargets.targets.indexOf(target.getBattlerIndex()) > -1
           ? [ target.getBattlerIndex() ]
-          : [ moveTargets.targets[Utils.randInt(moveTargets.targets.length)] ];
+          : [ moveTargets.targets[user.randSeedInt(moveTargets.targets.length)] ];
       user.getMoveQueue().push({ move: move.moveId, targets: targets, ignorePP: this.enemyMoveset });
       user.scene.unshiftPhase(new MovePhase(user.scene, user, targets, moveset[moveIndex], true));
       return true;
@@ -2712,7 +2714,7 @@ export class RandomMoveAttr extends OverrideMoveEffectAttr {
   apply(user: Pokemon, target: Pokemon, move: Move, args: any[]): Promise<boolean> {
     return new Promise(resolve => {
       const moveIds = Utils.getEnumValues(Moves).filter(m => !allMoves[m].hasFlag(MoveFlags.IGNORE_VIRTUAL));
-      const moveId = moveIds[Utils.randInt(moveIds.length)];
+      const moveId = moveIds[user.randSeedInt(moveIds.length)];
       
       const moveTargets = getMoveTargets(user, moveId);
       if (!moveTargets.targets.length) {
@@ -2723,7 +2725,7 @@ export class RandomMoveAttr extends OverrideMoveEffectAttr {
         ? moveTargets.targets
         : moveTargets.targets.indexOf(target.getBattlerIndex()) > -1
           ? [ target.getBattlerIndex() ]
-          : [ moveTargets.targets[Utils.randInt(moveTargets.targets.length)] ];
+          : [ moveTargets.targets[user.randSeedInt(moveTargets.targets.length)] ];
       user.getMoveQueue().push({ move: moveId, targets: targets, ignorePP: true });
       user.scene.unshiftPhase(new MovePhase(user.scene, user, targets, new PokemonMove(moveId, 0, 0, true), true));
       initMoveAnim(moveId).then(() => {
@@ -2760,7 +2762,7 @@ export class CopyMoveAttr extends OverrideMoveEffectAttr {
       ? moveTargets.targets
       : moveTargets.targets.indexOf(target.getBattlerIndex()) > -1
         ? [ target.getBattlerIndex() ]
-        : [ moveTargets.targets[Utils.randInt(moveTargets.targets.length)] ];
+        : [ moveTargets.targets[user.randSeedInt(moveTargets.targets.length)] ];
     user.getMoveQueue().push({ move: lastMove, targets: targets, ignorePP: true });
 
     user.scene.unshiftPhase(new MovePhase(user.scene, user as PlayerPokemon, targets, new PokemonMove(lastMove, 0, 0, true), true));
@@ -2945,7 +2947,7 @@ export function getMoveTargets(user: Pokemon, move: Moves): MoveTargetSet {
       multiple = moveTarget !== MoveTarget.NEAR_ENEMY;
       break;
     case MoveTarget.RANDOM_NEAR_ENEMY:
-      set = [ opponents[Utils.randInt(opponents.length)] ];
+      set = [ opponents[user.randSeedInt(opponents.length)] ];
       break;
     case MoveTarget.ATTACKER:
         return { targets: [ -1 as BattlerIndex ], multiple: false };
@@ -3250,7 +3252,7 @@ export function initMoves() {
     new StatusMove(Moves.REFLECT, "Reflect (N)", Type.PSYCHIC, -1, 20, 74, "A wondrous wall of light is put up to reduce damage from physical attacks for five turns.", -1, 0, 1)
       .target(MoveTarget.USER_SIDE),
     new SelfStatusMove(Moves.FOCUS_ENERGY, "Focus Energy", Type.NORMAL, -1, 30, -1, "The user takes a deep breath and focuses so that critical hits land more easily.", -1, 0, 1)
-      .attr(AddBattlerTagAttr, BattlerTagType.CRIT_BOOST, true, undefined, true),
+      .attr(AddBattlerTagAttr, BattlerTagType.CRIT_BOOST, true, true),
     new AttackMove(Moves.BIDE, "Bide (N)", Type.NORMAL, MoveCategory.PHYSICAL, -1, -1, 10, -1, "The user endures attacks for two turns, then strikes back to cause double the damage taken.", -1, 1, 1)
       .ignoresVirtual()
       .target(MoveTarget.USER),
@@ -3397,7 +3399,7 @@ export function initMoves() {
     new AttackMove(Moves.THIEF, "Thief", Type.DARK, MoveCategory.PHYSICAL, 60, 100, 25, 18, "The user attacks and steals the target's held item simultaneously. The user can't steal anything if it already holds an item.", -1, 0, 2)
       .attr(StealHeldItemAttr),
     new StatusMove(Moves.SPIDER_WEB, "Spider Web", Type.BUG, -1, 10, -1, "The user ensnares the target with thin, gooey silk so it can't flee from battle.", -1, 0, 2)
-      .attr(AddBattlerTagAttr, BattlerTagType.TRAPPED, false, 1, true),
+      .attr(AddBattlerTagAttr, BattlerTagType.TRAPPED, false, true, 1),
     new StatusMove(Moves.MIND_READER, "Mind Reader", Type.NORMAL, -1, 5, -1, "The user senses the target's movements with its mind to ensure its next attack does not miss the target.", -1, 0, 2)
       .attr(IgnoreAccuracyAttr),
     new StatusMove(Moves.NIGHTMARE, "Nightmare", Type.GHOST, 100, 15, -1, "A sleeping target sees a nightmare that inflicts some damage every turn.", -1, 0, 2)
@@ -3501,7 +3503,7 @@ export function initMoves() {
     new AttackMove(Moves.STEEL_WING, "Steel Wing", Type.STEEL, MoveCategory.PHYSICAL, 70, 90, 25, -1, "The target is hit with wings of steel. This may also raise the user's Defense stat.", 10, 0, 2)
       .attr(StatChangeAttr, BattleStat.DEF, 1, true),
     new StatusMove(Moves.MEAN_LOOK, "Mean Look", Type.NORMAL, -1, 5, -1, "The user pins the target with a dark, arresting look. The target becomes unable to flee.", -1, 0, 2)
-      .attr(AddBattlerTagAttr, BattlerTagType.TRAPPED, false, 1, true),
+      .attr(AddBattlerTagAttr, BattlerTagType.TRAPPED, false, true, 1),
     new StatusMove(Moves.ATTRACT, "Attract", Type.NORMAL, 100, 15, -1, "If it is the opposite gender of the user, the target becomes infatuated and less likely to attack.", -1, 0, 2)
       .attr(AddBattlerTagAttr, BattlerTagType.INFATUATED)
       .condition((user, target, move) => user.isOppositeGender(target)),
@@ -3538,7 +3540,7 @@ export function initMoves() {
       .attr(ForceSwitchOutAttr, true, true)
       .hidesUser(),
     new StatusMove(Moves.ENCORE, "Encore", Type.NORMAL, 100, 5, 122, "The user compels the target to keep using the move it encored for three turns.", -1, 0, 2)
-      .attr(AddBattlerTagAttr, BattlerTagType.ENCORE, false, undefined, true)
+      .attr(AddBattlerTagAttr, BattlerTagType.ENCORE, false, true)
       .condition((user, target, move) => new EncoreTag(move.id, user.id).canAdd(target)),
     new AttackMove(Moves.PURSUIT, "Pursuit (N)", Type.DARK, MoveCategory.PHYSICAL, 40, 100, 20, -1, "The power of this attack move is doubled if it's used on a target that's switching out of battle.", -1, 0, 2),
     new AttackMove(Moves.RAPID_SPIN, "Rapid Spin", Type.NORMAL, MoveCategory.PHYSICAL, 50, 100, 40, -1, "A spin attack that can also eliminate such moves as Bind, Wrap, and Leech Seed. This also raises the user's Speed stat.", 100, 0, 2)
@@ -3642,7 +3644,7 @@ export function initMoves() {
       .attr(RandomMovesetMoveAttr, true)
       .ignoresVirtual(),
     new SelfStatusMove(Moves.INGRAIN, "Ingrain", Type.GRASS, -1, 20, -1, "The user lays roots that restore its HP on every turn. Because it's rooted, it can't switch out.", -1, 0, 3)
-      .attr(AddBattlerTagAttr, BattlerTagType.INGRAIN, true, undefined, true),
+      .attr(AddBattlerTagAttr, BattlerTagType.INGRAIN, true, true),
     new AttackMove(Moves.SUPERPOWER, "Superpower", Type.FIGHTING, MoveCategory.PHYSICAL, 120, 100, 5, -1, "The user attacks the target with great power. However, this also lowers the user's Attack and Defense stats.", 100, 0, 3)
       .attr(StatChangeAttr, [ BattleStat.ATK, BattleStat.DEF ], -1, true),
     new SelfStatusMove(Moves.MAGIC_COAT, "Magic Coat (N)", Type.PSYCHIC, -1, 15, -1, "Moves like Leech Seed and moves that inflict status conditions are blocked by a barrier and reflected back to the user of those moves.", -1, 4, 3),
@@ -3650,7 +3652,7 @@ export function initMoves() {
     new AttackMove(Moves.REVENGE, "Revenge (N)", Type.FIGHTING, MoveCategory.PHYSICAL, 60, 100, 10, -1, "This attack move's power is doubled if the user has been hurt by the opponent in the same turn.", -1, -4, 3),
     new AttackMove(Moves.BRICK_BREAK, "Brick Break (N)", Type.FIGHTING, MoveCategory.PHYSICAL, 75, 100, 15, 58, "The user attacks with a swift chop. It can also break barriers, such as Light Screen and Reflect.", -1, 0, 3),
     new StatusMove(Moves.YAWN, "Yawn", Type.NORMAL, -1, 10, -1, "The user lets loose a huge yawn that lulls the target into falling asleep on the next turn.", -1, 0, 3)
-      .attr(AddBattlerTagAttr, BattlerTagType.DROWSY, false, undefined, true)
+      .attr(AddBattlerTagAttr, BattlerTagType.DROWSY, false, true)
       .condition((user, target, move) => !target.status),
     new AttackMove(Moves.KNOCK_OFF, "Knock Off (N)", Type.DARK, MoveCategory.PHYSICAL, 65, 100, 20, -1, "The user slaps down the target's held item, and that item can't be used in that battle. The move does more damage if the target has a held item.", -1, 0, 3),
     new AttackMove(Moves.ENDEAVOR, "Endeavor", Type.NORMAL, MoveCategory.PHYSICAL, -1, 100, 5, -1, "This attack move cuts down the target's HP to equal the user's HP.", -1, 0, 3)
@@ -3782,7 +3784,7 @@ export function initMoves() {
     new SelfStatusMove(Moves.IRON_DEFENSE, "Iron Defense", Type.STEEL, -1, 15, 104, "The user hardens its body's surface like iron, sharply raising its Defense stat.", -1, 0, 3)
       .attr(StatChangeAttr, BattleStat.DEF, 2, true),
     new StatusMove(Moves.BLOCK, "Block", Type.NORMAL, -1, 5, -1, "The user blocks the target's way with arms spread wide to prevent escape.", -1, 0, 3)
-      .attr(AddBattlerTagAttr, BattlerTagType.TRAPPED, false, 1, true),
+      .attr(AddBattlerTagAttr, BattlerTagType.TRAPPED, false, true, 1),
     new StatusMove(Moves.HOWL, "Howl", Type.NORMAL, -1, 40, -1, "The user howls loudly to raise the spirit of itself and allies. This raises their Attack stats.", -1, 0, 3)
       .attr(StatChangeAttr, BattleStat.ATK, 1, true)
       .soundBased()
@@ -3833,7 +3835,7 @@ export function initMoves() {
       .attr(StatChangeAttr, BattleStat.SPATK, -2, true),
     new SelfStatusMove(Moves.ROOST, "Roost", Type.FLYING, -1, 10, -1, "The user lands and rests its body. This move restores the user's HP by up to half of its max HP.", -1, 0, 4)
       .attr(HealAttr, 0.5)
-      .attr(AddBattlerTagAttr, BattlerTagType.IGNORE_FLYING, true, 1),
+      .attr(AddBattlerTagAttr, BattlerTagType.IGNORE_FLYING, true, false, 1),
     new StatusMove(Moves.GRAVITY, "Gravity", Type.PSYCHIC, -1, 5, -1, "This move enables Flying-type Pokémon or Pokémon with the Levitate Ability to be hit by Ground-type moves. Moves that involve flying can't be used.", -1, 0, 4)
       .attr(AddArenaTagAttr, ArenaTagType.GRAVITY, 5)
       .target(MoveTarget.BOTH_SIDES),
@@ -3884,7 +3886,7 @@ export function initMoves() {
     new SelfStatusMove(Moves.POWER_TRICK, "Power Trick (N)", Type.PSYCHIC, -1, 10, -1, "The user employs its psychic power to switch its Attack stat with its Defense stat.", -1, 0, 4),
     new StatusMove(Moves.GASTRO_ACID, "Gastro Acid (N)", Type.POISON, 100, 10, -1, "The user hurls up its stomach acids on the target. The fluid eliminates the effect of the target's Ability.", -1, 0, 4),
     new StatusMove(Moves.LUCKY_CHANT, "Lucky Chant (N)", Type.NORMAL, -1, 30, -1, "The user chants an incantation toward the sky, preventing opposing Pokémon from landing critical hits for five turns.", -1, 0, 4)
-      .attr(AddBattlerTagAttr, BattlerTagType.NO_CRIT, false, 5)
+      .attr(AddBattlerTagAttr, BattlerTagType.NO_CRIT, false, false, 5)
       .target(MoveTarget.USER_SIDE),
     new StatusMove(Moves.ME_FIRST, "Me First (N)", Type.NORMAL, -1, 20, -1, "The user cuts ahead of the target to copy and use the target's intended move with greater power. This move fails if it isn't used first.", -1, 0, 4)
       .ignoresVirtual()
@@ -3904,7 +3906,7 @@ export function initMoves() {
       .target(MoveTarget.ENEMY_SIDE),
     new StatusMove(Moves.HEART_SWAP, "Heart Swap (N)", Type.PSYCHIC, -1, 10, -1, "The user employs its psychic power to switch stat changes with the target.", -1, 0, 4),
     new SelfStatusMove(Moves.AQUA_RING, "Aqua Ring", Type.WATER, -1, 20, -1, "The user envelops itself in a veil made of water. It regains some HP every turn.", -1, 0, 4)
-      .attr(AddBattlerTagAttr, BattlerTagType.AQUA_RING, true, undefined, true),
+      .attr(AddBattlerTagAttr, BattlerTagType.AQUA_RING, true, true),
     new SelfStatusMove(Moves.MAGNET_RISE, "Magnet Rise (N)", Type.ELECTRIC, -1, 10, -1, "The user levitates using electrically generated magnetism for five turns.", -1, 0, 4),
     new AttackMove(Moves.FLARE_BLITZ, "Flare Blitz", Type.FIRE, MoveCategory.PHYSICAL, 120, 100, 15, 165, "The user cloaks itself in fire and charges the target. This also damages the user quite a lot. This attack may leave the target with a burn.", 10, 0, 4)
       .attr(RecoilAttr)
@@ -4110,7 +4112,7 @@ export function initMoves() {
       .ignoresProtect()
       .target(MoveTarget.BOTH_SIDES),
     new AttackMove(Moves.SMACK_DOWN, "Smack Down", Type.ROCK, MoveCategory.PHYSICAL, 50, 100, 15, -1, "The user throws a stone or similar projectile to attack the target. A flying Pokémon will fall to the ground when it's hit.", 100, 0, 5)
-      .attr(AddBattlerTagAttr, BattlerTagType.IGNORE_FLYING, false, 5)
+      .attr(AddBattlerTagAttr, BattlerTagType.IGNORE_FLYING, false, false, 5)
       .makesContact(false),
     new AttackMove(Moves.STORM_THROW, "Storm Throw", Type.FIGHTING, MoveCategory.PHYSICAL, 60, 100, 10, -1, "The user strikes the target with a fierce blow. This attack always results in a critical hit.", -1, 0, 5)
       .attr(CritOnlyAttr),
@@ -4402,10 +4404,10 @@ export function initMoves() {
     new AttackMove(Moves.OBLIVION_WING, "Oblivion Wing", Type.FLYING, MoveCategory.SPECIAL, 80, 100, 10, -1, "The user absorbs its target's HP. The user's HP is restored by over half of the damage taken by the target.", -1, 0, 6)
       .attr(HitHealAttr, 0.75),
     new AttackMove(Moves.THOUSAND_ARROWS, "Thousand Arrows", Type.GROUND, MoveCategory.PHYSICAL, 90, 100, 10, -1, "This move also hits opposing Pokémon that are in the air. Those Pokémon are knocked down to the ground.", 100, 0, 6)
-      .attr(AddBattlerTagAttr, BattlerTagType.IGNORE_FLYING, false, 5)
+      .attr(AddBattlerTagAttr, BattlerTagType.IGNORE_FLYING, false, false, 5)
       .target(MoveTarget.ALL_NEAR_ENEMIES),
     new AttackMove(Moves.THOUSAND_WAVES, "Thousand Waves", Type.GROUND, MoveCategory.PHYSICAL, 90, 100, 10, -1, "The user attacks with a wave that crawls along the ground. Those it hits can't flee from battle.", -1, 0, 6)
-      .attr(AddBattlerTagAttr, BattlerTagType.TRAPPED, false, 1, true)
+      .attr(AddBattlerTagAttr, BattlerTagType.TRAPPED, false, true, 1)
       .target(MoveTarget.ALL_NEAR_ENEMIES),
     new AttackMove(Moves.LANDS_WRATH, "Land's Wrath", Type.GROUND, MoveCategory.PHYSICAL, 90, 100, 10, -1, "The user gathers the energy of the land and focuses that power on opposing Pokémon to damage them.", -1, 0, 6)
       .target(MoveTarget.ALL_NEAR_ENEMIES),
@@ -4608,7 +4610,7 @@ export function initMoves() {
     new SelfStatusMove(Moves.STUFF_CHEEKS, "Stuff Cheeks (N)", Type.NORMAL, -1, 10, -1, "The user eats its held Berry, then sharply raises its Defense stat.", 100, 0, 8),
     new SelfStatusMove(Moves.NO_RETREAT, "No Retreat", Type.FIGHTING, -1, 5, -1, "This move raises all the user's stats but prevents the user from switching out or fleeing.", 100, 0, 8)
       .attr(StatChangeAttr, [ BattleStat.ATK, BattleStat.DEF, BattleStat.SPATK, BattleStat.SPDEF, BattleStat.SPD ], 1, true)
-      .attr(AddBattlerTagAttr, BattlerTagType.TRAPPED, true, 1, true),
+      .attr(AddBattlerTagAttr, BattlerTagType.TRAPPED, true, true, 1),
     new StatusMove(Moves.TAR_SHOT, "Tar Shot (N)", Type.ROCK, 100, 15, -1, "The user pours sticky tar over the target, lowering the target's Speed stat. The target becomes weaker to Fire-type moves.", 100, 0, 8),
     new StatusMove(Moves.MAGIC_POWDER, "Magic Powder (N)", Type.PSYCHIC, 100, 20, -1, "The user scatters a cloud of magic powder that changes the target to Psychic type.", -1, 0, 8)
       .powderMove(),
@@ -4617,7 +4619,7 @@ export function initMoves() {
     new StatusMove(Moves.TEATIME, "Teatime (N)", Type.NORMAL, -1, 10, -1, "The user has teatime with all the Pokémon in the battle. Each Pokémon eats its held Berry.", -1, 0, 8)
       .target(MoveTarget.ALL),
     new StatusMove(Moves.OCTOLOCK, "Octolock (P)", Type.FIGHTING, 100, 15, -1, "The user locks the target in and prevents it from fleeing. This move also lowers the target's Defense and Sp. Def every turn.", -1, 0, 8)
-      .attr(AddBattlerTagAttr, BattlerTagType.TRAPPED, false, 1, true),
+      .attr(AddBattlerTagAttr, BattlerTagType.TRAPPED, false, true, 1),
     new AttackMove(Moves.BOLT_BEAK, "Bolt Beak (N)", Type.ELECTRIC, MoveCategory.PHYSICAL, 85, 100, 10, -1, "The user stabs the target with its electrified beak. If the user attacks before the target, the power of this move is doubled.", -1, 0, 8),
     new AttackMove(Moves.FISHIOUS_REND, "Fishious Rend (N)", Type.WATER, MoveCategory.PHYSICAL, 85, 100, 10, -1, "The user rends the target with its hard gills. If the user attacks before the target, the power of this move is doubled.", -1, 0, 8)
       .bitingMove(),
@@ -4965,7 +4967,7 @@ export function initMoves() {
     new AttackMove(Moves.HARD_PRESS, "Hard Press", Type.STEEL, MoveCategory.PHYSICAL, 100, 100, 5, -1, "The target is crushed with an arm, a claw, or the like to inflict damage. The more HP the target has left, the greater the move's power.", -1, 0, 9)
       .attr(OpponentHighHpPowerAttr),
     new StatusMove(Moves.DRAGON_CHEER, "Dragon Cheer (P)", Type.DRAGON, -1, 15, -1, "The user raises its allies' morale with a draconic cry so that their future attacks have a heightened chance of landing critical hits. This rouses Dragon types more.", 100, 0, 9)
-      .attr(AddBattlerTagAttr, BattlerTagType.CRIT_BOOST, false, undefined, true)
+      .attr(AddBattlerTagAttr, BattlerTagType.CRIT_BOOST, false, true)
       .target(MoveTarget.NEAR_ALLY),
     new AttackMove(Moves.ALLURING_VOICE, "Alluring Voice (N)", Type.FAIRY, MoveCategory.SPECIAL, 80, 100, 10, -1, "The user attacks the target using its angelic voice. This also confuses the target if its stats have been boosted during the turn.", -1, 0, 9),
     new AttackMove(Moves.TEMPER_FLARE, "Temper Flare (N)", Type.FIRE, MoveCategory.PHYSICAL, 75, 100, 10, -1, "Spurred by desperation, the user attacks the target. This move's power is doubled if the user's previous move failed.", -1, 0, 9),
diff --git a/src/data/status-effect.ts b/src/data/status-effect.ts
index cd9fa514a..4ae095265 100644
--- a/src/data/status-effect.ts
+++ b/src/data/status-effect.ts
@@ -16,14 +16,10 @@ export class Status {
   public turnCount: integer;
   public cureTurn: integer;
 
-  constructor(effect: StatusEffect, turnCount?: integer, cureTurn?: integer) {
+  constructor(effect: StatusEffect, turnCount: integer = 0, cureTurn?: integer) {
     this.effect = effect;
     this.turnCount = turnCount === undefined ? 0 : turnCount;
-    if (cureTurn === undefined) {
-      if (effect === StatusEffect.SLEEP)
-        this.cureTurn = Utils.randInt(3, 2);
-    } else
-      this.cureTurn = cureTurn;
+    this.cureTurn = cureTurn;
   }
 
   incrementTurn(): void {
diff --git a/src/modifier/modifier.ts b/src/modifier/modifier.ts
index 4dd137344..396466a30 100644
--- a/src/modifier/modifier.ts
+++ b/src/modifier/modifier.ts
@@ -565,7 +565,7 @@ export class SurviveDamageModifier extends PokemonHeldItemModifier {
     const pokemon = args[0] as Pokemon;
     const surviveDamage = args[1] as Utils.BooleanHolder;
 
-    if (!surviveDamage.value && Utils.randInt(10) < this.getStackCount()) {
+    if (!surviveDamage.value && pokemon.randSeedInt(10) < this.getStackCount()) {
       surviveDamage.value = true;
 
       pokemon.scene.queueMessage(getPokemonMessage(pokemon, ` hung on\nusing its ${this.type.name}!`));
@@ -598,9 +598,10 @@ export class FlinchChanceModifier extends PokemonHeldItemModifier {
   }
 
   apply(args: any[]): boolean {
+    const pokemon = args[0] as Pokemon;
     const flinched = args[1] as Utils.BooleanHolder;
 
-    if (!flinched.value && Utils.randInt(10) < this.getStackCount()) {
+    if (!flinched.value && pokemon.randSeedInt(10) < this.getStackCount()) {
       flinched.value = true;
       return true;
     }
@@ -741,7 +742,7 @@ export class BerryModifier extends PokemonHeldItemModifier {
     }
 
     const preserve = new Utils.BooleanHolder(false);
-    pokemon.scene.applyModifiers(PreserveBerryModifier, pokemon.isPlayer(), preserve);
+    pokemon.scene.applyModifiers(PreserveBerryModifier, pokemon.isPlayer(), pokemon, preserve);
 
     getBerryEffectFunc(this.berryType)(pokemon);
     if (!preserve.value)
@@ -769,12 +770,12 @@ export class PreserveBerryModifier extends PersistentModifier {
   }
 
   shouldApply(args: any[]): boolean {
-    return super.shouldApply(args) && args[0] instanceof Utils.BooleanHolder;
+    return super.shouldApply(args) && args[0] instanceof Pokemon && args[1] instanceof Utils.BooleanHolder;
   }
 
   apply(args: any[]): boolean {
-    if (!(args[0] as Utils.BooleanHolder).value)
-      (args[0] as Utils.BooleanHolder).value = Utils.randInt(this.getMaxStackCount(null)) < this.getStackCount();
+    if (!(args[1] as Utils.BooleanHolder).value)
+      (args[1] as Utils.BooleanHolder).value = (args[0] as Pokemon).randSeedInt(this.getMaxStackCount(null)) < this.getStackCount();
 
     return true;
   }
@@ -1396,7 +1397,7 @@ export abstract class HeldItemTransferModifier extends PokemonHeldItemModifier {
     if (!opponents.length)
       return false;
 
-    const targetPokemon = opponents[Utils.randInt(opponents.length)];
+    const targetPokemon = opponents[pokemon.randSeedInt(opponents.length)];
 
     const transferredItemCount = this.getTransferredItemCount();
     if (!transferredItemCount)
@@ -1413,7 +1414,7 @@ export abstract class HeldItemTransferModifier extends PokemonHeldItemModifier {
     for (let i = 0; i < transferredItemCount; i++) {
       if (!itemModifiers.length)
         break;
-      const randItemIndex = Utils.randInt(itemModifiers.length);
+      const randItemIndex = pokemon.randSeedInt(itemModifiers.length);
       const randItem = itemModifiers[randItemIndex];
       heldItemTransferPromises.push(pokemon.scene.tryTransferHeldItemModifier(randItem, pokemon, false, false, true).then(success => {
         if (success) {
diff --git a/src/pokemon.ts b/src/pokemon.ts
index 9393208c0..6f30ffd37 100644
--- a/src/pokemon.ts
+++ b/src/pokemon.ts
@@ -132,7 +132,7 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
       this.fusionShiny = dataSource.fusionShiny;
       this.fusionGender = dataSource.fusionGender;
     } else {
-      this.id = Utils.randSeedInt(4294967295);
+      this.id = Utils.randSeedInt(4294967296);
       this.ivs = ivs || [
         Utils.binToDec(Utils.decToBin(this.id).substring(0, 5)),
         Utils.binToDec(Utils.decToBin(this.id).substring(5, 10)),
@@ -956,7 +956,7 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
             if (source.getTag(BattlerTagType.CRIT_BOOST))
               critLevel.value += 2;
             const critChance = Math.ceil(16 / Math.pow(2, critLevel.value));
-            isCritical = !source.getTag(BattlerTagType.NO_CRIT) && !(this.getAbility().hasAttr(BlockCritAbAttr)) && (critChance === 1 || !Utils.randInt(critChance));
+            isCritical = !source.getTag(BattlerTagType.NO_CRIT) && !(this.getAbility().hasAttr(BlockCritAbAttr)) && (critChance === 1 || !this.scene.currentBattle.randSeedInt(critChance));
           }
           const sourceAtk = source.getBattleStat(isPhysical ? Stat.ATK : Stat.SPATK, this);
           const targetDef = this.getBattleStat(isPhysical ? Stat.DEF : Stat.SPDEF, source);
@@ -968,7 +968,7 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
           applyAbAttrs(StabBoostAbAttr, source, null, stabMultiplier);
 
           if (!isTypeImmune) {
-            damage.value = Math.ceil(((((2 * source.level / 5 + 2) * power.value * sourceAtk / targetDef) / 50) + 2) * stabMultiplier.value * typeMultiplier.value * weatherTypeMultiplier * ((Utils.randInt(15) + 85) / 100)) * criticalMultiplier;
+            damage.value = Math.ceil(((((2 * source.level / 5 + 2) * power.value * sourceAtk / targetDef) / 50) + 2) * stabMultiplier.value * typeMultiplier.value * weatherTypeMultiplier * ((this.scene.currentBattle.randSeedInt(15) + 85) / 100)) * criticalMultiplier;
             if (isPhysical && source.status && source.status.effect === StatusEffect.BURN)
               damage.value = Math.floor(damage.value / 2);
             move.getAttrs(HitsTagAttr).map(hta => hta as HitsTagAttr).filter(hta => hta.doubleDamage).forEach(hta => {
@@ -1087,14 +1087,14 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
     return this.species.speciesId === Species.ETERNATUS && this.formIndex === 1;
   }
 
-  addTag(tagType: BattlerTagType, turnCount?: integer, sourceMove?: Moves, sourceId?: integer): boolean {
+  addTag(tagType: BattlerTagType, turnCount: integer = 0, sourceMove?: Moves, sourceId?: integer): boolean {
     const existingTag = this.getTag(tagType);
     if (existingTag) {
       existingTag.onOverlap(this);
       return false;
     }
 
-    const newTag = getBattlerTag(tagType, turnCount || 0, sourceMove, sourceId);
+    const newTag = getBattlerTag(tagType, turnCount, sourceMove, sourceId);
 
     const cancelled = new Utils.BooleanHolder(false);
     applyPreApplyBattlerTagAbAttrs(PreApplyBattlerTagAbAttr, this, newTag, cancelled);
@@ -1387,10 +1387,14 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
     if (cancelled.value)
       return false;
 
-    if (effect === StatusEffect.SLEEP)
-      this.setFrameRate(4);
+    let cureTurn: integer;
 
-    this.status = new Status(effect);
+    if (effect === StatusEffect.SLEEP) {
+      cureTurn = this.randSeedIntRange(2, 4);
+      this.setFrameRate(4);
+    }
+
+    this.status = new Status(effect, 0, cureTurn);
     return true;
   }
 
@@ -1693,6 +1697,16 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
     fusionCanvas.remove();
   }
 
+  randSeedInt(range: integer, min: integer = 0): integer {
+    return this.scene.currentBattle
+      ? this.scene.currentBattle.randSeedInt(range, min)
+      : Utils.randSeedInt(range, min);
+  }
+
+  randSeedIntRange(min: integer, max: integer): integer {
+    return this.randSeedInt((max - min) + 1, min);
+  }
+
   destroy(): void {
     this.battleInfo.destroy();
     super.destroy();
@@ -1958,7 +1972,7 @@ export class EnemyPokemon extends Pokemon {
       }
       switch (this.aiType) {
         case AiType.RANDOM:
-          const moveId = movePool[Utils.randInt(movePool.length)].moveId;
+          const moveId = movePool[this.scene.currentBattle.randSeedInt(movePool.length)].moveId;
           return { move: moveId, targets: this.getNextTargets(moveId) };
         case AiType.SMART_RANDOM:
         case AiType.SMART:
@@ -1990,7 +2004,7 @@ export class EnemyPokemon extends Pokemon {
           });
           let r = 0;
           if (this.aiType === AiType.SMART_RANDOM) {
-            while (r < sortedMovePool.length - 1 && Utils.randInt(8) >= 5)
+            while (r < sortedMovePool.length - 1 && this.scene.currentBattle.randSeedInt(8) >= 5)
               r++;
           }
           console.log(movePool.map(m => m.getName()), moveScores, r, sortedMovePool.map(m => m.getName()));
@@ -2043,7 +2057,7 @@ export class EnemyPokemon extends Pokemon {
       return total;
     }, 0);
 
-    const randValue = Utils.randInt(totalWeight);
+    const randValue = this.scene.currentBattle.randSeedInt(totalWeight);
     let targetIndex: integer;
 
     thresholds.every((t, i) => {
diff --git a/src/utils.ts b/src/utils.ts
index c51ae2b08..67bcf421f 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -2,12 +2,12 @@ export function toReadableString(str: string): string {
   return str.replace(/\_/g, ' ').split(' ').map(s => `${s.slice(0, 1)}${s.slice(1).toLowerCase()}`).join(' ');
 }
 
-export function randomString(length: integer) {
+export function randomString(length: integer, seeded: boolean = false) {
   const characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
   let result = '';
   
   for (let i = 0; i < length; i++) {
-    const randomIndex = Math.floor(Math.random() * characters.length);
+    const randomIndex = seeded ? randSeedInt(characters.length) : Math.floor(Math.random() * characters.length);
     result += characters[randomIndex];
   }
   
@@ -56,17 +56,13 @@ export function padInt(value: integer, length: integer, padWith?: string): strin
   return valueStr;
 }
 
-export function randInt(range: integer, min?: integer): integer {
-  if (!min)
-    min = 0;
+export function randInt(range: integer, min: integer = 0): integer {
   if (range === 1)
     return min;
   return Math.floor(Math.random() * range) + min;
 }
 
-export function randSeedInt(range: integer, min?: integer): integer {
-  if (!min)
-    min = 0;
+export function randSeedInt(range: integer, min: integer = 0): integer {
   if (range === 1)
     return min;
   return Phaser.Math.RND.integerInRange(min, (range - 1) + min);
@@ -162,9 +158,7 @@ export function apiFetch(path: string): Promise<Response> {
   });
 }
 
-export function apiPost(path: string, data?: any, contentType?: string): Promise<Response> {
-  if (!contentType)
-    contentType = 'application/json';
+export function apiPost(path: string, data?: any, contentType: string = 'application/json'): Promise<Response> {
   return new Promise((resolve, reject) => {
     const headers = {
       'Accept': contentType,