Generation Vii
Dancer
When another Pokémon uses a dance move, it can use a dance move following it regardless of its Speed.
Detailed Effect
Whenever another Pokémon uses a dance move, this Pokémon will use the same move immediately afterwards.
Pokémon With Dancer
4 canonical Pokémon forms can have this Ability.

Oricorio Baile
Oricorio Pom Pom 
Oricorio Pau
Oricorio Sensu