diff --git a/sim/dex-species.ts b/sim/dex-species.ts
index b62d7a48bc..b0e324aba7 100644
--- a/sim/dex-species.ts
+++ b/sim/dex-species.ts
@@ -477,6 +477,7 @@ export class DexSpecies {
 				(!['Ditto', 'Undiscovered'].includes(species.eggGroups[0]) && !species.prevo && species.name !== 'Manaphy');
 			if (this.dex.gen === 1) species.bst -= species.baseStats.spd;
 			if (this.dex.gen < 5) delete species.abilities['H'];
+			if (this.dex.gen === 3 && this.dex.abilities.get(species.abilities['1']).gen === 4) delete species.abilities['1'];
 		} else {
 			species = new Species({
 				id, name: id,