I'd use Rampardos. I'm guessing you're thinking of Power Trick Shuckle. Now then, there are a few problems with that. For one thing, it takes a turn to set up, meaning you're wasting another turn of Trick Room. Shuckle will also be OHKOd by priority. Rampardos meanwhile can possibly survive a priority hit. It also has an excellent ability and has no need to set up for it to start sweeping the foe. Another option would be to use Rhydon or Rhyperior, as they have more bulk to them and they still have low Speed and great Attack.