I think the Agility set is already on Smogon's analysis page. I guess it could work as a late-game cleaner.
I think Metal Sound is a good idea but it has an unsound (pun intended) 85% accuracy, which sucks. But if it does hit I foresee the opponent getting shuffled to no end and taking constant hazard damage. Also I'd recommend Roost over one of the coverage moves. Otherwise Zapdos dies faster.
Edit: Got ninja'd. I still prefer HP Grass > HP Ice though, otherwise Swampert and Rhyperior become bitches.