Darkrai

Darkrai is a Dark-type Legendary Pokémon that first appeared in Pokémon Diamond and Pearl. It has the ability to put people to sleep and give them never-ending nightmares (though this is done as a defence mechanism rather than out of malice). In Super Smash Bros. for Nintendo 3DS / Wii U, it can be spawned from a Poké Ball and attacks by using Dark Void, creating a large dark sphere around itself that puts any opponent that enters it to sleep and deals minor damage to them.