Generation Vi
Aura Break
The effects of “Aura” Abilities are reversed.
Detailed Effect
While this Pokémon is on the field, Dark Aura and Fairy Aura weaken moves of their respective types to 2/3 their power, rather than strengthening them.
Pokémon With Aura Break
2 canonical Pokémon forms can have this Ability.
Zygarde 50 
Zygarde 10