diff --git a/src/phases/encounter-phase.ts b/src/phases/encounter-phase.ts
index 9345170e718..b53b151072f 100644
--- a/src/phases/encounter-phase.ts
+++ b/src/phases/encounter-phase.ts
@@ -125,7 +125,7 @@ export class EncounterPhase extends BattlePhase {
             !!globalScene.getEncounterBossSegments(battle.waveIndex, level, enemySpecies),
           );
           if (globalScene.currentBattle.battleSpec === BattleSpec.FINAL_BOSS) {
-            battle.enemyParty[e].ivs = new Array(6).fill(31);
+            battle.enemyParty[e].ivs.fill(31);
           }
           globalScene
             .getPlayerParty()
diff --git a/src/ui/handlers/battle-message-ui-handler.ts b/src/ui/handlers/battle-message-ui-handler.ts
index f845f22a730..79e7e318915 100644
--- a/src/ui/handlers/battle-message-ui-handler.ts
+++ b/src/ui/handlers/battle-message-ui-handler.ts
@@ -195,7 +195,7 @@ export class BattleMessageUiHandler extends MessageUiHandler {
     super.showDialogue(text, name, delay, callback, callbackDelay, prompt, promptDelay);
   }
 
-  promptLevelUpStats(partyMemberIndex: number, prevStats: number[], showTotals: boolean): Promise<void> {
+  promptLevelUpStats(partyMemberIndex: number, prevStats: ArrayLike<number>, showTotals: boolean): Promise<void> {
     return new Promise(resolve => {
       if (!globalScene.showLevelUpStats) {
         return resolve();
@@ -219,7 +219,7 @@ export class BattleMessageUiHandler extends MessageUiHandler {
     });
   }
 
-  promptIvs(pokemonId: number, ivs: number[]): Promise<void> {
+  promptIvs(pokemonId: number, ivs: ArrayLike<number>): Promise<void> {
     return new Promise(resolve => {
       globalScene.executeWithSeedOffset(() => {
         let levelUpStatsValuesText = "";