Powder basic implementation

src/data/battler-tags.ts

@@ -542,6 +542,41 @@ export class SeedTag extends BattlerTag {
   }
 }
 
+/**
+ * BattlerTag representing the effects of {@link https://bulbapedia.bulbagarden.net/wiki/Powder_(move) | Powder}.
+ * When the afflicted Pokemon uses a Fire-type move, the move is cancelled, and the
+ * Pokemon takes damage equal to 1/4 of it's maximum HP (rounded down).
+ */
+export class PowderTag extends BattlerTag {
+  constructor() {
+    super(BattlerTagType.POWDER, [ BattlerTagLapseType.PRE_MOVE, BattlerTagLapseType.TURN_END ], 1);
+  }
+
+  onAdd(pokemon: Pokemon): void {
+    super.onAdd(pokemon);
+
+    pokemon.scene.queueMessage(i18next.t("battlerTags:powderOnAdd", { pokemonNameWithAffix: getPokemonNameWithAffix(pokemon) }));
+  }
+
+  lapse(pokemon: Pokemon, lapseType: BattlerTagLapseType): boolean {
+    if (lapseType === BattlerTagLapseType.PRE_MOVE) {
+      const movePhase = pokemon.scene.getCurrentPhase();
+      if (movePhase instanceof MovePhase) {
+        const move = movePhase.move.getMove();
+        if (move.type === Type.FIRE) {
+          movePhase.cancel();
+          pokemon.damageAndUpdate(Math.floor(pokemon.getMaxHp() / 4), HitResult.OTHER);
+
+          pokemon.scene.queueMessage(i18next.t("battlerTags:powderLapse"));
+        }
+      }
+      return true;
+    } else {
+      return super.lapse(pokemon, lapseType);
+    }
+  }
+}
+
 export class NightmareTag extends BattlerTag {
   constructor() {
     super(BattlerTagType.NIGHTMARE, BattlerTagLapseType.AFTER_MOVE, 1, Moves.NIGHTMARE);
@@ -1846,6 +1881,8 @@ export function getBattlerTag(tagType: BattlerTagType, turnCount: number, source
     return new InfatuatedTag(sourceMove, sourceId);
   case BattlerTagType.SEEDED:
     return new SeedTag(sourceId);
+  case BattlerTagType.POWDER:
+    return new PowderTag();
   case BattlerTagType.NIGHTMARE:
     return new NightmareTag();
   case BattlerTagType.FRENZY:

src/data/move.ts

@@ -7864,8 +7864,8 @@ export function initMoves() {
       .attr(StatChangeAttr, [ BattleStat.ATK, BattleStat.SPATK, BattleStat.SPD ], -1, false, (user, target, move) => target.status?.effect === StatusEffect.POISON || target.status?.effect === StatusEffect.TOXIC)
       .target(MoveTarget.ALL_NEAR_ENEMIES),
     new StatusMove(Moves.POWDER, Type.BUG, 100, 20, -1, 1, 6)
-      .powderMove()
+      .attr(AddBattlerTagAttr, BattlerTagType.POWDER, false, true)
-      .unimplemented(),
+      .powderMove(),
     new SelfStatusMove(Moves.GEOMANCY, Type.FAIRY, -1, 10, -1, 0, 6)
       .attr(ChargeAttr, ChargeAnim.GEOMANCY_CHARGING, i18next.t("moveTriggers:isChargingPower", {pokemonName: "{USER}"}))
       .attr(StatChangeAttr, [ BattleStat.SPATK, BattleStat.SPDEF, BattleStat.SPD ], 2, true)

src/enums/battler-tag-type.ts

@@ -69,5 +69,6 @@ export enum BattlerTagType {
   GULP_MISSILE_ARROKUDA = "GULP_MISSILE_ARROKUDA",
   GULP_MISSILE_PIKACHU = "GULP_MISSILE_PIKACHU",
   BEAK_BLAST_CHARGING = "BEAK_BLAST_CHARGING",
-  SHELL_TRAP = "SHELL_TRAP"
+  SHELL_TRAP = "SHELL_TRAP",
+  POWDER = "POWDER"
 }