Crobat

Say hello to Crobat, a Pokemon banished to BL in the past two generations, hinting at just how good it really is. Its good defensive typing and decent bulk allow it to act as a very good check to a lot of the metagame's most prominent threats, such as Roserade, Shaymin, Mienshao, Scrafty, and Heracross. Crobat also performs excellently as a stallbreaker, thanks to a combination of Taunt, Roost, and its great Speed. A decent Attack stat and the high Base Power of Brave Bird also allow it to deal heavy damage without the need for much investment. Crobat's poor offensive movepool and a weakness to Stealth Rock let it down at times, but fret not, as this speedy bat is still one of the best at what it does, and as long as you know its limitations, it will not let you down.