Togekiss

Togekiss has been best known for being one of the two "hax" Pokemon, with the other being Jirachi. The combination of Serene Grace, a paralysis move, access to Roost, and a STAB move with a 30% flinch chance leaves the opponent with only a 30% chance to attack, which makes Togekiss almost impossible to take out. All in all, it is one of the most infuriating Pokemon in the game. That is not all, though; Togekiss can also run an effective Nasty Plot set, as it is one of the few Pokemon with access to the move. Combine that with a very respectable base 120 Special Attack stat, and you get a Pokemon that can lay down the hurt on unprepared teams. Unfortunately, Togekiss isn't without its flaws. Its weakness to Stealth Rock is a crippling one, as it means Togekiss will lose a quarter of its health every time it switches in. While Togekiss does have access to Roost, the fast-paced nature of the DW metagame makes it hard for it to use Roost often. Additionally, its below-average base 80 Speed stat also leaves Togekiss easily revenge killed.