Marvel Scale (Japanese: ふしぎなうろこ Marvelous Scale) is an Ability introduced in Generation III. Prior to Generation V, it was the signature Ability of Milotic.
While the Pokémon with this Ability has a status condition, its Defense is increased by 50%.
In the Mystery Dungeon series, a Pokémon with a status problem with this Ability will have a 50% defense bonus when hit by a physical attack.
Marvel Scale has no effect outside of battle.