Generation Iv
Adaptability
Powers up moves of the same type.
Detailed Effect
This Pokémon inflicts twice as much damage with moves whose types match its own, rather than the usual same-type attack bonus of 1.5×.
Pokémon With Adaptability
20 canonical Pokémon forms can have this Ability.

Eevee
Porygon Z
Basculin Red Striped 
Basculegion Male
Basculin Blue Striped
Mega Lucario 
Mega Beedrill
Eevee Starter
Eevee Gmax
Basculin White Striped
Basculegion Female
Mega Glimmora
Corphish
Crawdaunt
Feebas
Skrelp
Dragalge
Yungoos
Gumshoos
Gumshoos Totem