diff --git a/public/audio/bgm/mystery_encounter_delibirdy.mp3 b/public/audio/bgm/mystery_encounter_delibirdy.mp3
new file mode 100644
index 00000000000..515a429aaba
Binary files /dev/null and b/public/audio/bgm/mystery_encounter_delibirdy.mp3 differ
diff --git a/public/audio/bgm/mystery_encounter_fun_and_games.mp3 b/public/audio/bgm/mystery_encounter_fun_and_games.mp3
index a9660d75e90..7864bf7a73d 100644
Binary files a/public/audio/bgm/mystery_encounter_fun_and_games.mp3 and b/public/audio/bgm/mystery_encounter_fun_and_games.mp3 differ
diff --git a/public/audio/bgm/mystery_encounter_gen_5_gts.mp3 b/public/audio/bgm/mystery_encounter_gen_5_gts.mp3
index 989a7f9c598..d03c8f8d4d5 100644
Binary files a/public/audio/bgm/mystery_encounter_gen_5_gts.mp3 and b/public/audio/bgm/mystery_encounter_gen_5_gts.mp3 differ
diff --git a/public/audio/bgm/mystery_encounter_gen_6_gts.mp3 b/public/audio/bgm/mystery_encounter_gen_6_gts.mp3
index 2c574da66ae..c921a01c204 100644
Binary files a/public/audio/bgm/mystery_encounter_gen_6_gts.mp3 and b/public/audio/bgm/mystery_encounter_gen_6_gts.mp3 differ
diff --git a/public/audio/bgm/mystery_encounter_weird_dream.mp3 b/public/audio/bgm/mystery_encounter_weird_dream.mp3
index a630fe549db..433e07bab08 100644
Binary files a/public/audio/bgm/mystery_encounter_weird_dream.mp3 and b/public/audio/bgm/mystery_encounter_weird_dream.mp3 differ
diff --git a/src/battle-scene.ts b/src/battle-scene.ts
index 2434ac4647d..6e07f8f4ae6 100644
--- a/src/battle-scene.ts
+++ b/src/battle-scene.ts
@@ -2157,6 +2157,16 @@ export default class BattleScene extends SceneBase {
       return 13.13;
     case "battle_macro_boss": //SWSH Rose Battle
       return 11.42;
+    case "mystery_encounter_gen_5_gts": // BW GTS
+      return 8.52;
+    case "mystery_encounter_gen_6_gts": // XY GTS
+      return 9.24;
+    case "mystery_encounter_fun_and_games": // EoS Guildmaster Wigglytuff
+      return 4.78;
+    case "mystery_encounter_weird_dream": // EoS Temporal Spire
+      return 41.42;
+    case "mystery_encounter_delibirdy": // Firel Delibirdy
+      return 82.28;
     }
 
     return 0;
diff --git a/src/data/mystery-encounters/encounters/delibirdy-encounter.ts b/src/data/mystery-encounters/encounters/delibirdy-encounter.ts
index b562ee99db2..ca2fb59d198 100644
--- a/src/data/mystery-encounters/encounters/delibirdy-encounter.ts
+++ b/src/data/mystery-encounters/encounters/delibirdy-encounter.ts
@@ -93,6 +93,17 @@ export const DelibirdyEncounter: MysteryEncounter =
     .withOnInit((scene: BattleScene) => {
       const encounter = scene.currentBattle.mysteryEncounter!;
       encounter.setDialogueToken("delibirdName", getPokemonSpecies(Species.DELIBIRD).getName());
+
+      scene.loadBgm("mystery_encounter_delibirdy", "mystery_encounter_delibirdy.mp3");
+      return true;
+    })
+    .withOnVisualsStart((scene: BattleScene) => {
+      // Change the bgm
+      scene.fadeOutBgm(2000, false);
+      scene.time.delayedCall(2000, () => {
+        scene.playBgm("mystery_encounter_delibirdy");
+      });
+
       return true;
     })
     .withOption(
diff --git a/src/locales/en/bgm-name.json b/src/locales/en/bgm-name.json
index c2babed4dff..eb37d0e7c76 100644
--- a/src/locales/en/bgm-name.json
+++ b/src/locales/en/bgm-name.json
@@ -151,5 +151,6 @@
   "mystery_encounter_weird_dream": "PMD EoS Temporal Spire",
   "mystery_encounter_fun_and_games": "PMD EoS Guildmaster Wigglytuff",
   "mystery_encounter_gen_5_gts": "BW GTS",
-  "mystery_encounter_gen_6_gts": "XY GTS"
+  "mystery_encounter_gen_6_gts": "XY GTS",
+  "mystery_encounter_delibirdy": "Firel - Delibir-dy!"
 }
diff --git a/src/overrides.ts b/src/overrides.ts
index ec0577ceb3d..2b69e90ec40 100644
--- a/src/overrides.ts
+++ b/src/overrides.ts
@@ -145,7 +145,7 @@ class DefaultOverrides {
   /** 1 to 256, set to null to ignore */
   readonly MYSTERY_ENCOUNTER_RATE_OVERRIDE: number | null = null;
   readonly MYSTERY_ENCOUNTER_TIER_OVERRIDE: MysteryEncounterTier | null = null;
-  readonly MYSTERY_ENCOUNTER_OVERRIDE: MysteryEncounterType | null = null;
+  readonly MYSTERY_ENCOUNTER_OVERRIDE: MysteryEncounterType | null = MysteryEncounterType.DELIBIRDY;
 
   // -------------------------
   // MODIFIER / ITEM OVERRIDES