Hippowdon

Hippowdon's phenomenal bulk coupled with a solid typing and access to some good support moves in Stealth Rock, Whirlwind, and Slack Off allow it to act as a really good blanket check to some common threats such as Mega Pinsir, Mega Mawile, Mega Charizard X, and Tyranitar. Sand Stream helps when it comes to dealing with rain teams and Mega Charizard Y. Unfortunately, Hippowdon's Ground typing makes it weak to Grass-, Water-, and Ice-type attacks, which are used by very common Pokemon such as Tapu Bulu, Greninja, and Weavile. Hippowdon is also very passive; it's easily shut down by Taunt and can become setup fodder if it doesn't pack Whirlwind.