diff --git a/src/data/balance/pokemon-evolutions.ts b/src/data/balance/pokemon-evolutions.ts
index 9e86ea7397b..d1b67950c9f 100644
--- a/src/data/balance/pokemon-evolutions.ts
+++ b/src/data/balance/pokemon-evolutions.ts
@@ -8,10 +8,10 @@ import { Nature } from "#enums/nature";
 import { Biome } from "#enums/biome";
 import { Moves } from "#enums/moves";
 import { Species } from "#enums/species";
-import { TimeOfDay } from "#enums/time-of-day";
-import { DamageMoneyRewardModifier, ExtraModifierModifier, MoneyMultiplierModifier, TempExtraModifierModifier } from "#app/modifier/modifier";
 import { SpeciesFormKey } from "#enums/species-form-key";
-
+import { TimeOfDay } from "#enums/time-of-day";
+import { DamageMoneyRewardModifier, ExtraModifierModifier, MoneyMultiplierModifier, SpeciesStatBoosterModifier, TempExtraModifierModifier } from "#app/modifier/modifier";
+import { SpeciesStatBoosterModifierType } from "#app/modifier/modifier-type";
 
 export enum SpeciesWildEvolutionDelay {
   NONE,
@@ -1571,8 +1571,8 @@ export const pokemonEvolutions: PokemonEvolutions = {
     new SpeciesEvolution(Species.DUSKNOIR, 1, EvolutionItem.REAPER_CLOTH, null, SpeciesWildEvolutionDelay.VERY_LONG)
   ],
   [Species.CLAMPERL]: [
-    new SpeciesEvolution(Species.HUNTAIL, 1, EvolutionItem.LINKING_CORD, new SpeciesEvolutionCondition(p => p.gender === Gender.MALE, p => p.gender = Gender.MALE /* Deep Sea Tooth */), SpeciesWildEvolutionDelay.VERY_LONG),
-    new SpeciesEvolution(Species.GOREBYSS, 1, EvolutionItem.LINKING_CORD, new SpeciesEvolutionCondition(p => p.gender === Gender.FEMALE, p => p.gender = Gender.FEMALE /* Deep Sea Scale */), SpeciesWildEvolutionDelay.VERY_LONG)
+    new SpeciesEvolution(Species.HUNTAIL, 1, EvolutionItem.LINKING_CORD, new SpeciesEvolutionCondition(p => !!p.scene.findModifier(m => m instanceof SpeciesStatBoosterModifier && (m.type as SpeciesStatBoosterModifierType).key === "DEEP_SEA_TOOTH")), SpeciesWildEvolutionDelay.VERY_LONG),
+    new SpeciesEvolution(Species.GOREBYSS, 1, EvolutionItem.LINKING_CORD, new SpeciesEvolutionCondition(p => !!p.scene.findModifier(m => m instanceof SpeciesStatBoosterModifier && (m.type as SpeciesStatBoosterModifierType).key === "DEEP_SEA_SCALE")), SpeciesWildEvolutionDelay.VERY_LONG)
   ],
   [Species.BOLDORE]: [
     new SpeciesEvolution(Species.GIGALITH, 1, EvolutionItem.LINKING_CORD, null, SpeciesWildEvolutionDelay.VERY_LONG)
diff --git a/src/modifier/modifier-type.ts b/src/modifier/modifier-type.ts
index 540af8a0b41..11ff23fb9cb 100644
--- a/src/modifier/modifier-type.ts
+++ b/src/modifier/modifier-type.ts
@@ -581,7 +581,7 @@ export type SpeciesStatBoosterItem = keyof typeof SpeciesStatBoosterModifierType
  * @implements GeneratedPersistentModifierType
  */
 export class SpeciesStatBoosterModifierType extends PokemonHeldItemModifierType implements GeneratedPersistentModifierType {
-  private key: SpeciesStatBoosterItem;
+  public key: SpeciesStatBoosterItem;
 
   constructor(key: SpeciesStatBoosterItem) {
     const item = SpeciesStatBoosterModifierTypeGenerator.items[key];
@@ -1024,6 +1024,8 @@ class SpeciesStatBoosterModifierTypeGenerator extends ModifierTypeGenerator {
     THICK_CLUB: { stats: [ Stat.ATK ], multiplier: 2, species: [ Species.CUBONE, Species.MAROWAK, Species.ALOLA_MAROWAK ]},
     METAL_POWDER: { stats: [ Stat.DEF ], multiplier: 2, species: [ Species.DITTO ]},
     QUICK_POWDER: { stats: [ Stat.SPD ], multiplier: 2, species: [ Species.DITTO ]},
+    DEEP_SEA_SCALE: { stats: [ Stat.SPDEF ], multiplier: 2, species: [ Species.CLAMPERL ]},
+    DEEP_SEA_TOOTH: { stats: [ Stat.SPATK ], multiplier: 2, species: [ Species.CLAMPERL ]},
   };
 
   constructor() {