Cresselia

An insane 120 / 120 / 130 bulk makes Cresselia one of the bulkiest Pokemon in the entire metagame. Cresselia's ability, Levitate, is very useful to deal with common Earthquakes and helps her partner use it freely. With her bulk and movepool, Cresselia is one of the best support Pokemon; she can also easily set up Trick Room. Despite Cresselia's huge bulk, she is not impossible to take down. Powerful super effective STAB moves, such as Shadow Ball from Aegislash and Knock Off from Bisharp, deal lots of damage to her. Some Mega Evolutions, such as Mega Kangaskhan, Mega Salamence, and Mega Mawile, have enough power to hurt Cresselia badly. Though Cresselia has a decent offensive movepool, she has mediocre offenses, and decline in popularity of Fighting-type Pokemon hurt Psychic-type offensively, meaning that Taunt can shut her down easily.