Omastar

Thanks to its high Special Attack stat, Omastar has always been a decent Rain Dance sweeper; however, it is let down by its poor Speed and many weaknesses courtesy of its secondary Rock typing. For these reasons, Omastar was more often used as a hazard setter; it is one of the few Pokemon with access to all three of Stealth Rock, Spikes, and Toxic Spikes. BW, though, has blessed Omastar with one of the best setup moves in the entire game--Shell Smash. A move that sharply raises Attack, Special Attack, and Speed, Shell Smash was distributed to only a few select users, among whom Omastar is one of the best, because of its excellent Special Attack. Shell Smash also patches up any Speed issues that Omastar previously had, making this shellfish one of the most threatening sweepers around.