From Bulbapedia, the community-driven Pokémon encyclopedia.

Huge Power (Japanese: ちからもち Power Charge) is an ability introduced in Generation III that doubles Attack.

In Mystery Dungeon, instead of doubling attack, the Pokémon will have a one-in-three chance of dealing 50% more damage than normal when an attack is used.

Only three Pokémon have this ability, all in the same evolutionary line. See also Pure Power.

Pokémon with Huge Power

Single ability

No Pokémon have Huge Power as their only ability.

Dual ability

Azurill	Marill	Azumarill
Thick Fat	Thick Fat	Thick Fat