Marvel Scale

 is a Pokémon ability introduced in the third generation. It increases defense when the user is afflicted with a status condition.

Description
When a Pokémon with this Ability has a status condition, its Defense is increased by 50%.

Mystery Dungeon series.
Pokémon with this Ability with a status problem will have a 50% defense bonus when hit by a physical attack.

Pokémon with Ability

 * Milotic

As a Hidden Ability

 * Dratini
 * Dragonair