Added some tracking, but not enough.

src/battle-scene.ts

@@ -10,7 +10,7 @@ import { initCommonAnims, initMoveAnim, loadCommonAnimAssets, loadMoveAnimAssets
 import { Phase } from "#app/phase";
 import { initGameSpeed } from "#app/system/game-speed";
 import { Arena, ArenaBase } from "#app/field/arena";
-import { GameData } from "#app/system/game-data";
+import { GameData, BiomeSessionData } from "#app/system/game-data";
 import { addTextObject, getTextColor, TextStyle } from "#app/ui/text";
 import { allMoves } from "#app/data/move";
 import { MusicPreference } from "#app/system/settings/settings";
@@ -259,6 +259,7 @@ export default class BattleScene extends SceneBase {
   public pokeballCounts: PokeballCounts;
   public money: integer;
   public pokemonInfoContainer: PokemonInfoContainer;
+  public biomeTracker: BiomeSessionData;
   private party: PlayerPokemon[];
   /** Session save data that pertains to Mystery Encounters */
   public mysteryEncounterSaveData: MysteryEncounterSaveData = new MysteryEncounterSaveData();
@@ -1324,6 +1325,22 @@ export default class BattleScene extends SceneBase {
   }
 
   newArena(biome: Biome): Arena {
+    const biomeTrackerLimit = 22;
+    if (Utils.isNullOrUndefined(this.biomeTracker)) {
+      this.biomeTracker = {};
+    }
+    if (this.currentBattle) {
+      this.biomeTracker[this.currentBattle.waveIndex] = biome;
+    } else {
+      this.biomeTracker[1] = biome;
+    }
+    const biomeTrackerKeys = Object.keys(this.biomeTracker).map(Number);
+    console.log(this.biomeTracker);
+    // Arbitrary limit of 22 entries per session --> Can increase or decrease
+    while (biomeTrackerKeys.length >= biomeTrackerLimit ) {
+      const smallestWave = Math.min.apply(Math, biomeTrackerKeys);
+      delete this.biomeTracker[smallestWave];
+    }
     this.arena = new Arena(this, biome, Biome[biome].toLowerCase());
     this.eventTarget.dispatchEvent(new NewArenaEvent());
 

src/system/game-data.ts

@@ -39,6 +39,7 @@ import { Device } from "#enums/devices";
 import { GameDataType } from "#enums/game-data-type";
 import { Moves } from "#enums/moves";
 import { PlayerGender } from "#enums/player-gender";
+import { Biome } from "#enums/biome";
 import { Species } from "#enums/species";
 import { applyChallenges, ChallengeType } from "#app/data/challenge";
 import { WeatherType } from "#enums/weather-type";
@@ -136,12 +137,17 @@ export interface SessionSaveData {
   challenges: ChallengeData[];
   mysteryEncounterType: MysteryEncounterType | -1; // Only defined when current wave is ME,
   mysteryEncounterSaveData: MysteryEncounterSaveData;
+  biomeTracker: BiomeSessionData;
 }
 
 interface Unlocks {
   [key: integer]: boolean;
 }
 
+export interface BiomeSessionData {
+  [key: number]: Biome;
+}
+
 interface AchvUnlocks {
   [key: string]: integer
 }
@@ -963,7 +969,8 @@ export class GameData {
       timestamp: new Date().getTime(),
       challenges: scene.gameMode.challenges.map(c => new ChallengeData(c)),
       mysteryEncounterType: scene.currentBattle.mysteryEncounter?.encounterType ?? -1,
-      mysteryEncounterSaveData: scene.mysteryEncounterSaveData
+      mysteryEncounterSaveData: scene.mysteryEncounterSaveData,
+      biomeTracker: scene.biomeTracker
     } as SessionSaveData;
   }
 
@@ -1023,6 +1030,7 @@ export class GameData {
 
           scene.sessionPlayTime = sessionData.playTime || 0;
           scene.lastSavePlayTime = 0;
+          scene.biomeTracker = sessionData.biomeTracker || {};
 
           const loadPokemonAssets: Promise<void>[] = [];