Darkrai

Darkrai is one of the most threatening Pokemon in the Anything Goes metagame thanks to its ability to put to sleep as many foes as it wants to in a row thanks the lack of a Sleep Clause. Its combination of Dark Void and excellent Speed makes it an incredibly difficult Pokemon to handle, and it can put to sleep and sweep entire teams with ease. Additionally, it has solid a Special Attack stat that can be boosted by Nasty Plot to make it a highly potent offensive sweeper, and it can also run multiple different options to demolish some of its checks. However, Darkrai's mediocre bulk can leave it somewhat vulnerable to priority users and strong attackers, which it needs to put to sleep to take on. Additionally, it can be checked by certain Fairy-types such as Mega Diancie, Clefable, and Xerneas, and Dark Void's middling accuracy can leave Darkrai in difficult situations.