Seviper

Seviper has awesome mixed attacking stats and a fantastic offensive movepool, making it extremely unpredictable and incredibly hard to switch into. Poison is also a nice typing to switch into opposing Pokemon, and an offensive Pokemon that can switch into Choice Band Hitmonchan's STAB attacks is always a plus. Beyond that, though, it doesn't have much going for it. Shed Skin is neat to absorb status from defensive teams, but Seviper is super frail and a bit on the slow side. It languishes at the bottom of the pack for mixed attackers, as it ultimately doesn't offer that much over similar options in Crawdaunt, Cacturne, and Octillery and finds itself wanting either more bulk or more Speed in most battles.