Floatzel@Choice Band
-Jolly, Swift Swim
EVs: 252 Attack, 252 Speed
Waterfall/Aqua Jet
Ice Fang
Crunch/Pursuit
Brick Break/Pursuit
Aqua Jet only becomes an option when you don't have a Rain Dancer on your team. No Rain Dance for Floatzel, because he can't take time to set it up with his weak defenses. No Bulk Up either, he'll just be KO'd during the setup. Pursuit if you're a good predicter (yes, things will be running, he has decent attack + STAB + choice band), Crunch if you're not. Focus Punch and Giga Impact are also options, but are difficult to use correctly (use GI as a finishing move and Focus Punch on switches if you don't have Pursuit).