Hoopa

Hoopa is a Pokémon capable of summoning things with it's rings. It is known to be very silly sometimes, and it loves to summon other Pokemon, usually ones that are very strong.

In The Return of Albino Lugia, Hoopa summoned Melanistic Lugia and Mono just for fun, but it did not end up going well. Hoopa also summoned Yveltal, Cresselia, and Brawlgia.

Hoops does not know any attacks, as his own ability is to summon other things to attack instead.