diff --git a/src/field/pokemon.ts b/src/field/pokemon.ts
index 6df486aab39..a6e0140449b 100644
--- a/src/field/pokemon.ts
+++ b/src/field/pokemon.ts
@@ -3598,6 +3598,8 @@ export class PlayerPokemon extends Pokemon {
         newPokemon.moveset = this.moveset.slice();
         newPokemon.moveset = this.copyMoveset();
         newPokemon.luck = this.luck;
+        newPokemon.metBiome = this.metBiome;
+        newPokemon.metSpecies = this.metSpecies;
         newPokemon.fusionSpecies = this.fusionSpecies;
         newPokemon.fusionFormIndex = this.fusionFormIndex;
         newPokemon.fusionAbilityIndex = this.fusionAbilityIndex;
diff --git a/src/test/evolution.test.ts b/src/test/evolution.test.ts
index 41088c17bcb..060a2207822 100644
--- a/src/test/evolution.test.ts
+++ b/src/test/evolution.test.ts
@@ -76,12 +76,15 @@ describe("Evolution", () => {
 
     const nincada = game.scene.getPlayerPokemon()!;
     nincada.abilityIndex = 2;
+    nincada.metBiome = -1;
 
     nincada.evolve(pokemonEvolutions[Species.NINCADA][0], nincada.getSpeciesForm());
     const ninjask = game.scene.getParty()[0];
     const shedinja = game.scene.getParty()[1];
     expect(ninjask.abilityIndex).toBe(2);
     expect(shedinja.abilityIndex).toBe(1);
+    // Regression test for https://github.com/pagefaultgames/pokerogue/issues/3842
+    expect(shedinja.metBiome).toBe(-1);
   }, TIMEOUT);
 
   it("should set wild delay to NONE by default", () => {