Gens 4, 5 and 6
Aipom @ Eviolite
Ability: Anything(all of its abilities do nothing on this set)
EVs: 236 HP / 236 Spe / 36 SpD
You don't have to use the special moves I put on the set. You can use Grass Knot, any Hidden Power type, Swift(Round is outclassed by Swift because LC is not a doubles format, and Swift can beat noobs that use accuracy lowering moves), Thunder, or Water Pulse.