diff --git a/src/battle-scene.ts b/src/battle-scene.ts
index 996c3b0de87..0f8475e714b 100644
--- a/src/battle-scene.ts
+++ b/src/battle-scene.ts
@@ -1794,8 +1794,8 @@ export default class BattleScene extends SceneBase {
     return this.currentBattle;
   }
 
-  newArena(biome: Biome, playerFaints?: number): Arena {
-    this.arena = new Arena(biome, Biome[biome].toLowerCase(), playerFaints);
+  newArena(biome: Biome): Arena {
+    this.arena = new Arena(biome, Biome[biome].toLowerCase());
     this.eventTarget.dispatchEvent(new NewArenaEvent());
 
     this.arenaBg.pipelineData = {
diff --git a/src/field/arena.ts b/src/field/arena.ts
index 752eef81596..e8f792a34be 100644
--- a/src/field/arena.ts
+++ b/src/field/arena.ts
@@ -58,14 +58,14 @@ export class Arena {
 
   public readonly eventTarget: EventTarget = new EventTarget();
 
-  constructor(biome: Biome, bgm: string, playerFaints: number = 0) {
+  constructor(biome: Biome, bgm: string) {
     this.biomeType = biome;
     this.tags = [];
     this.bgm = bgm;
     this.trainerPool = biomeTrainerPools[biome];
     this.updatePoolsForTimeOfDay();
     this.playerTerasUsed = 0;
-    this.playerFaints = playerFaints;
+    this.playerFaints = 0;
   }
 
   init() {
diff --git a/src/phases/game-over-phase.ts b/src/phases/game-over-phase.ts
index d4b529fe00e..5e4e8e1cdf7 100644
--- a/src/phases/game-over-phase.ts
+++ b/src/phases/game-over-phase.ts
@@ -249,8 +249,7 @@ export class GameOverPhase extends BattlePhase {
       timestamp: new Date().getTime(),
       challenges: globalScene.gameMode.challenges.map(c => new ChallengeData(c)),
       mysteryEncounterType: globalScene.currentBattle.mysteryEncounter?.encounterType ?? -1,
-      mysteryEncounterSaveData: globalScene.mysteryEncounterSaveData,
-      playerFaints: globalScene.arena.playerFaints
+      mysteryEncounterSaveData: globalScene.mysteryEncounterSaveData
     } as SessionSaveData;
   }
 }
diff --git a/src/system/arena-data.ts b/src/system/arena-data.ts
index 518acb55c89..62c1ff9e9da 100644
--- a/src/system/arena-data.ts
+++ b/src/system/arena-data.ts
@@ -11,6 +11,7 @@ export default class ArenaData {
   public terrain: Terrain | null;
   public tags: ArenaTag[];
   public playerTerasUsed: number;
+  public playerFaints: number;
 
   constructor(source: Arena | any) {
     const sourceArena = source instanceof Arena ? source as Arena : null;
@@ -18,6 +19,7 @@ export default class ArenaData {
     this.weather = sourceArena ? sourceArena.weather : source.weather ? new Weather(source.weather.weatherType, source.weather.turnsLeft) : null;
     this.terrain = sourceArena ? sourceArena.terrain : source.terrain ? new Terrain(source.terrain.terrainType, source.terrain.turnsLeft) : null;
     this.playerTerasUsed = (sourceArena ? sourceArena.playerTerasUsed : source.playerTerasUsed) ?? 0;
+    this.playerFaints = (sourceArena ? sourceArena.playerFaints : source.playerFaints ) ?? 0;
     this.tags = [];
 
     if (source.tags) {
diff --git a/src/system/game-data.ts b/src/system/game-data.ts
index 57e25325ba4..d5e7381a443 100644
--- a/src/system/game-data.ts
+++ b/src/system/game-data.ts
@@ -143,10 +143,6 @@ export interface SessionSaveData {
   challenges: ChallengeData[];
   mysteryEncounterType: MysteryEncounterType | -1; // Only defined when current wave is ME,
   mysteryEncounterSaveData: MysteryEncounterSaveData;
-  /**
-   * Counts the amount of pokemon fainted in your party during the current arena encounter.
-   */
-  playerFaints: number;
 }
 
 interface Unlocks {
@@ -971,8 +967,7 @@ export class GameData {
       timestamp: new Date().getTime(),
       challenges: globalScene.gameMode.challenges.map(c => new ChallengeData(c)),
       mysteryEncounterType: globalScene.currentBattle.mysteryEncounter?.encounterType ?? -1,
-      mysteryEncounterSaveData: globalScene.mysteryEncounterSaveData,
-      playerFaints: globalScene.arena.playerFaints
+      mysteryEncounterSaveData: globalScene.mysteryEncounterSaveData
     } as SessionSaveData;
   }
 
@@ -1064,7 +1059,7 @@ export class GameData {
 
           globalScene.mysteryEncounterSaveData = new MysteryEncounterSaveData(sessionData.mysteryEncounterSaveData);
 
-          globalScene.newArena(sessionData.arena.biome, sessionData.playerFaints);
+          globalScene.newArena(sessionData.arena.biome);
 
           const battleType = sessionData.battleType || 0;
           const trainerConfig = sessionData.trainer ? trainerConfigs[sessionData.trainer.trainerType] : null;