Serene grace implementation idea

src/data/ability.ts

@@ -840,6 +840,13 @@ export class VariableMovePowerAbAttr extends PreAttackAbAttr {
   }
 }
 
+export class VariableMoveChanceAbAttr extends PreAttackAbAttr {
+  applyPreAttack(pokemon: Pokemon, passive: boolean, defender: Pokemon, move: PokemonMove, args: any[]): boolean {
+    //const chance = args[0] as Utils.NumberHolder;
+    return false;
+  }
+}
+
 export class VariableMoveTypeAbAttr extends AbAttr {
   apply(pokemon: Pokemon, passive: boolean, cancelled: Utils.BooleanHolder, args: any[]): boolean {
     //const power = args[0] as Utils.IntegerHolder;
@@ -923,6 +930,21 @@ export class MovePowerBoostAbAttr extends VariableMovePowerAbAttr {
   }
 }
 
+export class MoveChanceBoostAbAttr extends VariableMoveChanceAbAttr {
+  private chanceMultiplier: number;
+
+  constructor(chanceMultiplier: number) {
+    super(true);
+    this.chanceMultiplier = chanceMultiplier;
+  }
+
+  applyPreAttack(pokemon: Pokemon, passive: boolean, defender: Pokemon, move: PokemonMove, args: any[]): boolean {
+    (args[0] as Utils.NumberHolder).value *= this.chanceMultiplier;
+
+    return true;
+  }
+}
+
 export class MoveTypePowerBoostAbAttr extends MovePowerBoostAbAttr {
   constructor(boostedType: Type, powerMultiplier?: number) {
     super((pokemon, defender, move) => move.type === boostedType, powerMultiplier || 1.5);
@@ -2559,7 +2581,7 @@ export function initAbilities() {
       .attr(TypeImmunityStatChangeAbAttr, Type.ELECTRIC, BattleStat.SPATK, 1)
       .ignorable(),
     new Ability(Abilities.SERENE_GRACE, 3)
-      .unimplemented(),
+      .attr(MoveChanceBoostAbAttr, 2),
     new Ability(Abilities.SWIFT_SWIM, 3)
       .attr(BattleStatMultiplierAbAttr, BattleStat.SPD, 2)
       .condition(getWeatherCondition(WeatherType.RAIN, WeatherType.HEAVY_RAIN)),

src/field/pokemon.ts

@@ -27,7 +27,7 @@ import { TempBattleStat } from '../data/temp-battle-stat';
 import { ArenaTagSide, WeakenMoveScreenTag, WeakenMoveTypeTag } from '../data/arena-tag';
 import { ArenaTagType } from "../data/enums/arena-tag-type";
 import { Biome } from "../data/enums/biome";
-import { Ability, AbAttr, BattleStatMultiplierAbAttr, BlockCritAbAttr, BonusCritAbAttr, BypassBurnDamageReductionAbAttr, FieldPriorityMoveImmunityAbAttr, FieldVariableMovePowerAbAttr, IgnoreOpponentStatChangesAbAttr, MoveImmunityAbAttr, MoveTypeChangeAttr, NonSuperEffectiveImmunityAbAttr, PreApplyBattlerTagAbAttr, PreDefendFullHpEndureAbAttr, ReceivedMoveDamageMultiplierAbAttr, ReduceStatusEffectDurationAbAttr, StabBoostAbAttr, StatusEffectImmunityAbAttr, TypeImmunityAbAttr, VariableMovePowerAbAttr, VariableMoveTypeAbAttr, WeightMultiplierAbAttr, allAbilities, applyAbAttrs, applyBattleStatMultiplierAbAttrs, applyPostDefendAbAttrs, applyPreApplyBattlerTagAbAttrs, applyPreAttackAbAttrs, applyPreDefendAbAttrs, applyPreSetStatusAbAttrs, UnsuppressableAbilityAbAttr, SuppressFieldAbilitiesAbAttr, NoFusionAbilityAbAttr } from '../data/ability';
+import { Ability, AbAttr, BattleStatMultiplierAbAttr, BlockCritAbAttr, BonusCritAbAttr, BypassBurnDamageReductionAbAttr, FieldPriorityMoveImmunityAbAttr, FieldVariableMovePowerAbAttr, IgnoreOpponentStatChangesAbAttr, MoveImmunityAbAttr, MoveTypeChangeAttr, NonSuperEffectiveImmunityAbAttr, PreApplyBattlerTagAbAttr, PreDefendFullHpEndureAbAttr, ReceivedMoveDamageMultiplierAbAttr, ReduceStatusEffectDurationAbAttr, StabBoostAbAttr, StatusEffectImmunityAbAttr, TypeImmunityAbAttr, VariableMovePowerAbAttr, VariableMoveChanceAbAttr, VariableMoveTypeAbAttr, WeightMultiplierAbAttr, allAbilities, applyAbAttrs, applyBattleStatMultiplierAbAttrs, applyPostDefendAbAttrs, applyPreApplyBattlerTagAbAttrs, applyPreAttackAbAttrs, applyPreDefendAbAttrs, applyPreSetStatusAbAttrs, UnsuppressableAbilityAbAttr, SuppressFieldAbilitiesAbAttr, NoFusionAbilityAbAttr } from '../data/ability';
 import { Abilities } from "#app/data/enums/abilities";
 import PokemonData from '../system/pokemon-data';
 import Battle, { BattlerIndex } from '../battle';
@@ -1251,10 +1251,13 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
       case MoveCategory.SPECIAL:
         const isPhysical = moveCategory === MoveCategory.PHYSICAL;
         const power = new Utils.NumberHolder(move.power);
+        const chance = new Utils.NumberHolder(move.chance);
         const sourceTeraType = source.getTeraType();
         if (sourceTeraType !== Type.UNKNOWN && sourceTeraType === type && power.value < 60 && move.priority <= 0 && !move.getAttrs(MultiHitAttr).length && !this.scene.findModifier(m => m instanceof PokemonMultiHitModifier && m.pokemonId === source.id))
           power.value = 60;
         applyPreAttackAbAttrs(VariableMovePowerAbAttr, source, this, battlerMove, power);
+        applyPreAttackAbAttrs(VariableMoveChanceAbAttr, source, this, battlerMove, chance);
+
         this.scene.getField(true).map(p => applyPreAttackAbAttrs(FieldVariableMovePowerAbAttr, this, source, battlerMove, power));
 
         applyPreDefendAbAttrs(ReceivedMoveDamageMultiplierAbAttr, this, source, battlerMove, cancelled, power);