Altaria

With a unique, good typing and useful utility movepool, Mega Altaria carves out a small niche in the tier. Its Dragon / Fairy typing lets it match up well against Ash-Greninja, Volcarona, and both of the Mega Charizard formes. In addition to this, it has great support options that include the coveted Heal Bell as well as Defog, and it has the option to stay in its pre-Mega Evolved forme in the early- to mid-game to make use of Natural Cure despite the Stealth Rock weakness and different typing. It isn't weak, either; its Pixilate-boosted Fairy-type STAB moves hit neutral targets for consistent damage and dissuade the likes of Kyurem-B from switching in. However, despite the coverage options it has, Mega Altaria can be prone to passivity considering the many different defensive answers to it that Mega Altaria requires different coverage to threaten. Secondly, the tier is crammed with Pokemon that outspeed and threaten out Mega Altaria, with Mega Mawile, Tapu Lele, and Mega Diancie all being able to OHKO it.