Marvel Scale raises the ability-bearer's Defense by 50% when inflicted by a major status ailment (poison, burn, paralysis, freeze or sleep). All effects of the status condition remain, e.g. losing HP each turn (poison, burn), speed drop (paralysis) or being unable to attack (paralysis, freeze, sleep).
There is only one Pokémon with this ability. and no Mega Evolved Pokémon are with this Ability.
Pokémon With This Ability