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ok so I'm not entirely sure this guys (cloyster) is OU, but I treat him like it so here's my build and tell me if it sucks, bear in mind that I needed a spiking wall to complement my fast, hard hitting dragons:
IV's: all are 31 but attack
Ev's: 252/0/252/4/0/0
Moves: Ice Beam, Hydro Pump...
If someone comes along with a flying type Pokemon and a dark Pokemon they can team sweep if it's a double battle, and you have a lot of holes. I usually have a similar mistake with a pure dragon team. Trust me these Pokemon may be your favs. But you defiantly need Pokemon in there that don't...