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Saw the nicknames and remembered battling you so I gotta chip in:)
Offensive Cress is pretty inferior to a defensive one (I tried it) because, as I've learned, a helping hand-boosted spread move (such as rock slide on Tyranitar) will deal more total damage than a Rock Slide+ *insert Cresselia...
Just my two cents:
He has use on Rain teams due to all the Water-types drawing electric attacks (and with that comes the ability to abuse a 100% accurate Thunder to use on the mixed set). And, since he relies on a Motor Drive boost anyway, he can use Cell Battery on the physical set to also...
First off- try Spiritomb or Dusknoir over Banette. They both can learn Trick and Grudge and the added bulkiness increases the chances of actually getting off a Grudge. Protect should go over Shadow Claw so that you can safely predict which move to use to disable them. Secondly- Scizor can fully...