This guy is boss in NU. If left unattended, he can sweep and leave the opponent in tears.
Here's my set!
Zangoose @ Toxic Orb
EVs: 252 Atk/252 Spd/4 Hp
Ability: Toxic Boost
Alright lemme explain. The item and ability are pretty self explanatory. Protect is to get that x2 attack before sweeping. Facade is standard STAB and with that ability and effect, this move is beast on this guy. Close Combat is to cover Steel-types and just a good move. Defense drops don't matter anyway because Zangoose has crap defense. Knock Off is to get rid of pesky items and hit Ghost-types super-effectively.
Hope this set brings victory to many!