diff --git a/src/field/pokemon.ts b/src/field/pokemon.ts
index b1e7f48d3db..3eb194d3966 100644
--- a/src/field/pokemon.ts
+++ b/src/field/pokemon.ts
@@ -3398,12 +3398,14 @@ export class EnemyPokemon extends Pokemon {
   public aiType: AiType;
   public bossSegments: integer;
   public bossSegmentIndex: integer;
+  public readonly isPopulatedFromDataSource: boolean;
 
   constructor(scene: BattleScene, species: PokemonSpecies, level: integer, trainerSlot: TrainerSlot, boss: boolean, dataSource: PokemonData) {
     super(scene, 236, 84, species, level, dataSource?.abilityIndex, dataSource?.formIndex,
       dataSource?.gender, dataSource ? dataSource.shiny : false, dataSource ? dataSource.variant : undefined, null, dataSource ? dataSource.nature : undefined, dataSource);
 
     this.trainerSlot = trainerSlot;
+    this.isPopulatedFromDataSource = !!dataSource;
     if (boss) {
       this.setBoss(boss, dataSource?.bossSegments);
     }
diff --git a/src/phases.ts b/src/phases.ts
index fcaf3ca4160..6865c030730 100644
--- a/src/phases.ts
+++ b/src/phases.ts
@@ -870,7 +870,7 @@ export class EncounterPhase extends BattlePhase {
     } else {
       if (battle.enemyParty.filter(p => p.isBoss()).length > 1) {
         for (const enemyPokemon of battle.enemyParty) {
-          if (enemyPokemon.isBoss()) {
+          if (enemyPokemon.isBoss() && !enemyPokemon.isPopulatedFromDataSource) {
             enemyPokemon.setBoss(true, Math.ceil(enemyPokemon.bossSegments * (enemyPokemon.getSpeciesForm().baseTotal / totalBst)));
             enemyPokemon.initBattleInfo();
           }