got the basics working for moves like growl etc, need to check all sources of stat changes

src/data/ability.ts

@@ -1702,7 +1702,7 @@ export class PreSwitchOutHealAbAttr extends PreSwitchOutAbAttr {
 }
 
 export class PreStatChangeAbAttr extends AbAttr {
-  applyPreStatChange(pokemon: Pokemon, passive: boolean, stat: BattleStat, cancelled: Utils.BooleanHolder, args: any[]): boolean | Promise<boolean> {
+  applyPreStatChange(pokemon: Pokemon, user: Pokemon, passive: boolean, stat: BattleStat, levels: integer, cancelled: Utils.BooleanHolder, args: any[]): boolean | Promise<boolean> {
     return false;
   }
 }
@@ -1716,7 +1716,7 @@ export class ProtectStatAbAttr extends PreStatChangeAbAttr {
     this.protectedStat = protectedStat;
   }
 
-  applyPreStatChange(pokemon: Pokemon, passive: boolean, stat: BattleStat, cancelled: Utils.BooleanHolder, args: any[]): boolean {
+  applyPreStatChange(pokemon: Pokemon, user: Pokemon, passive: boolean, stat: BattleStat, levels: integer, cancelled: Utils.BooleanHolder, args: any[]): boolean {
     if (this.protectedStat === undefined || stat === this.protectedStat) {
       cancelled.value = true;
       return true;
@@ -1730,6 +1730,28 @@ export class ProtectStatAbAttr extends PreStatChangeAbAttr {
   }
 }
 
+export class ReflectStatAbAttr extends PreStatChangeAbAttr {
+  private reflectedStat: BattleStat;
+
+  constructor(reflectedStat?: BattleStat) {
+    super();
+
+    this.reflectedStat = reflectedStat;
+  }
+
+  applyPreStatChange(pokemon: Pokemon, sourcePokemon: Pokemon, passive: boolean, stat: BattleStat, levels: integer, cancelled: Utils.BooleanHolder, args: any[]): boolean {
+    if ((this.reflectedStat === undefined || stat === this.reflectedStat) && pokemon !== sourcePokemon) {
+      cancelled.value = true;
+
+      const statChangePhase = new StatChangePhase(pokemon.scene, sourcePokemon.getBattlerIndex(), false, [stat], levels);
+      pokemon.scene.unshiftPhase(statChangePhase);
+      return true;
+    }
+    
+    return false;
+  }
+}
+
 export class PreSetStatusAbAttr extends AbAttr {
   applyPreSetStatus(pokemon: Pokemon, passive: boolean, effect: StatusEffect, cancelled: Utils.BooleanHolder, args: any[]): boolean | Promise<boolean> {
     return false;
@@ -2813,8 +2835,8 @@ export function applyPreSwitchOutAbAttrs(attrType: { new(...args: any[]): PreSwi
 }
 
 export function applyPreStatChangeAbAttrs(attrType: { new(...args: any[]): PreStatChangeAbAttr },
-  pokemon: Pokemon, stat: BattleStat, cancelled: Utils.BooleanHolder, ...args: any[]): Promise<void> {
+  pokemon: Pokemon, sourcePokemon: Pokemon, stat: BattleStat, levels: integer, cancelled: Utils.BooleanHolder, ...args: any[]): Promise<void> {
-  return applyAbAttrsInternal<PreStatChangeAbAttr>(attrType, pokemon, (attr, passive) => attr.applyPreStatChange(pokemon, passive, stat, cancelled, args), args);
+  return applyAbAttrsInternal<PreStatChangeAbAttr>(attrType, pokemon, (attr, passive) => attr.applyPreStatChange(pokemon, sourcePokemon, passive, stat, levels, cancelled, args), args);
 }
 
 export function applyPostStatChangeAbAttrs(attrType: { new(...args: any[]): PostStatChangeAbAttr },
@@ -3604,8 +3626,8 @@ export function initAbilities() {
     new Ability(Abilities.PROPELLER_TAIL, 8)
       .attr(BlockRedirectAbAttr),
     new Ability(Abilities.MIRROR_ARMOR, 8)
-      .ignorable()
+      .attr(ReflectStatAbAttr)
-      .unimplemented(),
+      .ignorable(),
     new Ability(Abilities.GULP_MISSILE, 8)
       .attr(UnsuppressableAbilityAbAttr)
       .attr(NoTransformAbilityAbAttr)

src/data/arena-tag.ts

@@ -439,7 +439,7 @@ class StickyWebTag extends ArenaTrapTag {
       if (!cancelled.value) {
         pokemon.scene.queueMessage(`The opposing ${pokemon.name} was caught in a sticky web!`);
         const statLevels = new Utils.NumberHolder(-1);
-        pokemon.scene.unshiftPhase(new StatChangePhase(pokemon.scene, pokemon.getBattlerIndex(), false, [BattleStat.SPD], statLevels.value));
+        pokemon.scene.unshiftPhase(new StatChangePhase(pokemon.scene, pokemon.getBattlerIndex(), false, [BattleStat.SPD], statLevels.value, true, false, true, pokemon.scene.getPokemonById(this.sourceId)));
       }
     }
 

src/data/move.ts

@@ -1733,7 +1733,7 @@ export class StatChangeAttr extends MoveEffectAttr {
 
     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, this.showMessage));
+      user.scene.unshiftPhase(new StatChangePhase(user.scene, (this.selfTarget ? user : target).getBattlerIndex(), this.selfTarget, this.stats, levels, this.showMessage, false, true, user));
       return true;
     }
 
@@ -1813,7 +1813,7 @@ export class AcupressureStatChangeAttr extends MoveEffectAttr {
     randStats = randStats.filter(s => target.summonData.battleStats[s] < 6);
     if (randStats.length > 0) {
       let boostStat = [randStats[Utils.randInt(randStats.length)]];
-      user.scene.unshiftPhase(new StatChangePhase(user.scene, target.getBattlerIndex(), this.selfTarget, boostStat, 2));
+      user.scene.unshiftPhase(new StatChangePhase(user.scene, target.getBattlerIndex(), this.selfTarget, boostStat, 2, true, false, true, user));
       return true;
     }
     return false;

src/phases.ts

@@ -30,7 +30,7 @@ import { Weather, WeatherType, getRandomWeatherType, getTerrainBlockMessage, get
 import { TempBattleStat } from "./data/temp-battle-stat";
 import { ArenaTagSide, ArenaTrapTag, MistTag, TrickRoomTag } from "./data/arena-tag";
 import { ArenaTagType } from "./data/enums/arena-tag-type";
-import { CheckTrappedAbAttr, IgnoreOpponentStatChangesAbAttr, PostAttackAbAttr, PostBattleAbAttr, PostDefendAbAttr, PostSummonAbAttr, PostTurnAbAttr, PostWeatherLapseAbAttr, PreSwitchOutAbAttr, PreWeatherDamageAbAttr, ProtectStatAbAttr, RedirectMoveAbAttr, BlockRedirectAbAttr, RunSuccessAbAttr, StatChangeMultiplierAbAttr, SuppressWeatherEffectAbAttr, SyncEncounterNatureAbAttr, applyAbAttrs, applyCheckTrappedAbAttrs, applyPostAttackAbAttrs, applyPostBattleAbAttrs, applyPostDefendAbAttrs, applyPostSummonAbAttrs, applyPostTurnAbAttrs, applyPostWeatherLapseAbAttrs, applyPreStatChangeAbAttrs, applyPreSwitchOutAbAttrs, applyPreWeatherEffectAbAttrs, BattleStatMultiplierAbAttr, applyBattleStatMultiplierAbAttrs, IncrementMovePriorityAbAttr, applyPostVictoryAbAttrs, PostVictoryAbAttr, applyPostBattleInitAbAttrs, PostBattleInitAbAttr, BlockNonDirectDamageAbAttr as BlockNonDirectDamageAbAttr, applyPostKnockOutAbAttrs, PostKnockOutAbAttr, PostBiomeChangeAbAttr, applyPostFaintAbAttrs, PostFaintAbAttr, IncreasePpAbAttr, PostStatChangeAbAttr, applyPostStatChangeAbAttrs, AlwaysHitAbAttr, PreventBerryUseAbAttr, StatChangeCopyAbAttr } from "./data/ability";
+import { CheckTrappedAbAttr, IgnoreOpponentStatChangesAbAttr, PostAttackAbAttr, PostBattleAbAttr, PostDefendAbAttr, PostSummonAbAttr, PostTurnAbAttr, PostWeatherLapseAbAttr, PreSwitchOutAbAttr, PreWeatherDamageAbAttr, ProtectStatAbAttr, RedirectMoveAbAttr, BlockRedirectAbAttr, RunSuccessAbAttr, StatChangeMultiplierAbAttr, SuppressWeatherEffectAbAttr, SyncEncounterNatureAbAttr, applyAbAttrs, applyCheckTrappedAbAttrs, applyPostAttackAbAttrs, applyPostBattleAbAttrs, applyPostDefendAbAttrs, applyPostSummonAbAttrs, applyPostTurnAbAttrs, applyPostWeatherLapseAbAttrs, applyPreStatChangeAbAttrs, applyPreSwitchOutAbAttrs, applyPreWeatherEffectAbAttrs, BattleStatMultiplierAbAttr, applyBattleStatMultiplierAbAttrs, IncrementMovePriorityAbAttr, applyPostVictoryAbAttrs, PostVictoryAbAttr, applyPostBattleInitAbAttrs, PostBattleInitAbAttr, BlockNonDirectDamageAbAttr as BlockNonDirectDamageAbAttr, applyPostKnockOutAbAttrs, PostKnockOutAbAttr, PostBiomeChangeAbAttr, applyPostFaintAbAttrs, PostFaintAbAttr, IncreasePpAbAttr, PostStatChangeAbAttr, applyPostStatChangeAbAttrs, AlwaysHitAbAttr, PreventBerryUseAbAttr, StatChangeCopyAbAttr, PreStatChangeAbAttr } from "./data/ability";
 import { Unlockables, getUnlockableName } from "./system/unlockables";
 import { getBiomeKey } from "./field/arena";
 import { BattleType, BattlerIndex, TurnCommand } from "./battle";
@@ -2739,8 +2739,19 @@ export class StatChangePhase extends PokemonPhase {
   private showMessage: boolean;
   private ignoreAbilities: boolean;
   private canBeCopied: boolean;
+  private sourcePokemon: Pokemon;
 
-  constructor(scene: BattleScene, battlerIndex: BattlerIndex, selfTarget: boolean, stats: BattleStat[], levels: integer, showMessage: boolean = true, ignoreAbilities: boolean = false, canBeCopied: boolean = true) {
+  constructor(
+    scene: BattleScene,
+    battlerIndex: BattlerIndex,
+    selfTarget: boolean,
+    stats: BattleStat[],
+    levels: integer,
+    showMessage: boolean = true,
+    ignoreAbilities: boolean = false,
+    canBeCopied: boolean = true,
+    sourcePokemon?: Pokemon,
+  ) {
     super(scene, battlerIndex);
 
     this.selfTarget = selfTarget;
@@ -2749,6 +2760,7 @@ export class StatChangePhase extends PokemonPhase {
     this.showMessage = showMessage;
     this.ignoreAbilities = ignoreAbilities;
     this.canBeCopied = canBeCopied;
+    this.sourcePokemon = sourcePokemon;
   }
 
   start() {
@@ -2773,7 +2785,7 @@ export class StatChangePhase extends PokemonPhase {
         this.scene.arena.applyTagsForSide(MistTag, pokemon.isPlayer() ? ArenaTagSide.PLAYER : ArenaTagSide.ENEMY, cancelled);
 
       if (!cancelled.value && !this.selfTarget && this.levels < 0)
-        applyPreStatChangeAbAttrs(ProtectStatAbAttr, this.getPokemon(), stat, cancelled);
+        applyPreStatChangeAbAttrs(PreStatChangeAbAttr, this.getPokemon(), this.sourcePokemon, stat, this.levels, cancelled);
       
       return !cancelled.value;
     });