There's also Copycat in doubles/triples, although I don't know if both moves at the same time are viable. Then again, with that special attack stat you could probably pour a lot of EVs into SPATK and throw in flamethrower and psychic (or any other special attack) for mixed coverage.
Max attack with a negative nature and no EVs is only 148 before Belly Drum, and I don't know the calculations to say if it'll hit hard enough after the drum. But considering you can trump just about any physical wall that pops out with either a super effective special move or a very tough STAB physical, it might be enough.
I'd say do some calculations or try raising one and testing it out. It'll probably do some major damage just from the surprise factor.