Implement Acrobatics

Currently scales from 0-5 items

src/data/move.ts

@@ -5171,7 +5171,7 @@ export function initMoves() {
     new StatusMove(Moves.QUASH, Type.DARK, 100, 15, -1, 0, 5)
       .unimplemented(),
     new AttackMove(Moves.ACROBATICS, Type.FLYING, MoveCategory.PHYSICAL, 55, 100, 15, -1, 0, 5)
-      .partial(),
+      .attr(MovePowerMultiplierAttr, (user, target, move) => Math.max(1, 2 - 0.2 * user.getHeldItems().reduce((v, m) => v + m.stackCount, 0))),
     new StatusMove(Moves.REFLECT_TYPE, Type.NORMAL, -1, 15, -1, 0, 5)
       .attr(CopyTypeAttr),
     new AttackMove(Moves.RETALIATE, Type.NORMAL, MoveCategory.PHYSICAL, 70, 100, 5, -1, 0, 5)

src/field/pokemon.ts

@@ -456,6 +456,12 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
     return 1;
   }
 
+  getHeldItems(): PokemonHeldItemModifier[] {
+    if (!this.scene)
+      return [];
+    return this.scene.findModifiers(m => m instanceof PokemonHeldItemModifier && (m as PokemonHeldItemModifier).pokemonId === this.id, this.isPlayer()) as PokemonHeldItemModifier[];
+   }
+
   updateScale(): void {
     this.setScale(this.getSpriteScale());
   }