Adaptability

Effect
Adaptability  increases the effectiveness of  STAB  moves from the usual 1.5× to 2×.

For example, a Water-type Pokemon using Surf (base power 90) would normally get an effective power of 135. With  Adaptability  it would be 180 instead.

Pokémon with Adaptability
Eevee,Corphish,Crawdaunt,Feebas