diff --git a/src/battle-scene.ts b/src/battle-scene.ts
index 289c9a8f051..59da590e9b0 100644
--- a/src/battle-scene.ts
+++ b/src/battle-scene.ts
@@ -299,7 +299,11 @@ export class BattleScene extends SceneBase {
   public seed: string;
   public waveSeed: string;
   public waveCycleOffset: number;
-  public offsetGym: boolean;
+  /**
+   * Whether to offset Gym Leader waves by 10 (30, 50, 70 instead of 20, 40, 60).
+   * Determined at the start of the run, and is unused for non-Classic game modes.
+   */
+  public offsetGym = false;
 
   public damageNumberHandler: DamageNumberHandler;
   private spriteSparkleHandler: PokemonSpriteSparkleHandler;
diff --git a/src/field/arena.ts b/src/field/arena.ts
index 3e214ff1ea7..fcdaa89370d 100644
--- a/src/field/arena.ts
+++ b/src/field/arena.ts
@@ -543,22 +543,24 @@ export class Arena {
     }
   }
 
-  getTimeOfDay(): TimeOfDay {
+  public getTimeOfDay(): TimeOfDay {
     switch (this.biomeType) {
       case BiomeId.ABYSS:
         return TimeOfDay.NIGHT;
     }
 
-    const waveCycle = ((globalScene.currentBattle?.waveIndex || 0) + globalScene.waveCycleOffset) % 40;
+    if (Overrides.TIME_OF_DAY_OVERRIDE != null) {
+      return Overrides.TIME_OF_DAY_OVERRIDE;
+    }
+
+    const waveCycle = ((globalScene.currentBattle?.waveIndex ?? 0) + globalScene.waveCycleOffset) % 40;
 
     if (waveCycle < 15) {
       return TimeOfDay.DAY;
     }
-
     if (waveCycle < 20) {
       return TimeOfDay.DUSK;
     }
-
     if (waveCycle < 35) {
       return TimeOfDay.NIGHT;
     }
@@ -566,6 +568,10 @@ export class Arena {
     return TimeOfDay.DAWN;
   }
 
+  /**
+   * @returns Whether the current biome takes place "outdoors"
+   * (for the purposes of time of day tints)
+   */
   isOutside(): boolean {
     switch (this.biomeType) {
       case BiomeId.SEABED:
@@ -584,23 +590,7 @@ export class Arena {
     }
   }
 
-  overrideTint(): [number, number, number] {
-    switch (Overrides.ARENA_TINT_OVERRIDE) {
-      case TimeOfDay.DUSK:
-        return [98, 48, 73].map(c => Math.round((c + 128) / 2)) as [number, number, number];
-      case TimeOfDay.NIGHT:
-        return [64, 64, 64];
-      case TimeOfDay.DAWN:
-      case TimeOfDay.DAY:
-      default:
-        return [128, 128, 128];
-    }
-  }
-
   getDayTint(): [number, number, number] {
-    if (Overrides.ARENA_TINT_OVERRIDE !== null) {
-      return this.overrideTint();
-    }
     switch (this.biomeType) {
       case BiomeId.ABYSS:
         return [64, 64, 64];
@@ -610,23 +600,14 @@ export class Arena {
   }
 
   getDuskTint(): [number, number, number] {
-    if (Overrides.ARENA_TINT_OVERRIDE) {
-      return this.overrideTint();
-    }
     if (!this.isOutside()) {
       return [0, 0, 0];
     }
 
-    switch (this.biomeType) {
-      default:
-        return [98, 48, 73].map(c => Math.round((c + 128) / 2)) as [number, number, number];
-    }
+    return [113, 88, 101];
   }
 
   getNightTint(): [number, number, number] {
-    if (Overrides.ARENA_TINT_OVERRIDE) {
-      return this.overrideTint();
-    }
     switch (this.biomeType) {
       case BiomeId.ABYSS:
       case BiomeId.SPACE:
@@ -638,10 +619,7 @@ export class Arena {
       return [64, 64, 64];
     }
 
-    switch (this.biomeType) {
-      default:
-        return [48, 48, 98];
-    }
+    return [48, 48, 98];
   }
 
   setIgnoreAbilities(ignoreAbilities: boolean, ignoringEffectSource: BattlerIndex | null = null): void {
diff --git a/src/overrides.ts b/src/overrides.ts
index 3f61196f0b4..77b594ff748 100644
--- a/src/overrides.ts
+++ b/src/overrides.ts
@@ -76,7 +76,11 @@ class DefaultOverrides {
   readonly BATTLE_STYLE_OVERRIDE: BattleStyle | null = null;
   readonly STARTING_WAVE_OVERRIDE: number = 0;
   readonly STARTING_BIOME_OVERRIDE: BiomeId | null = null;
-  readonly ARENA_TINT_OVERRIDE: TimeOfDay | null = null;
+  /**
+   * Overrides the Time of Day for the given biome.
+   * Set to `null` to disable.
+   */
+  readonly TIME_OF_DAY_OVERRIDE: Exclude<TimeOfDay, TimeOfDay.ALL> | null = null;
   /** Multiplies XP gained by this value including 0. Set to null to ignore the override. */
   readonly XP_MULTIPLIER_OVERRIDE: number | null = null;
   /**