Cresselia

As one of the most dominant Trick Room setters in the format, Cresselia has a large target on its back, and for good reason. Its excellent natural defenses make it one of the bulkiest Trick Room setters available, and its Levitate ability is also great in a metagame where Ground-type attacks are prevalent. Additionally, its large support movepool makes it very versatile and therefore able to pair well with many other common Pokemon; notably, access to a variety of support moves such as Magic Coat can make it unpredictable to battle against. An above average Speed stat and access to both Icy Wind and Thunder Wave also allow it to function outside of Trick Room should the need arise. However, its typing is mediocre defensively, as while it tanks many neutral attacks, a weakness to Dark-type attacks hurts it, particularly against teams with Yveltal, which are often geared to take full advantage of its Dark Aura ability. That same typing in combination with a low Special Attack stat also gives it very little offensive presence and therefore makes it vulnerable to Taunt and being set up on by Pokemon like Xerneas. Finally, it faces competition from restricted Trick Room setters such as Dialga and Palkia, which boast much greater offensive presence, provided a restricted Pokemon slot is available.