Here's a great set to annoy people in conjunction with a U-turn/Fake out/Regenerator Meinfoo!
EV's: 252 Attack, 252 Speed, 4 HP
U-Turn: Scouting, comboing.
Fake Out: Entry move, breaks subs, sturdy etc.
Sucker Punch: Great priority, STAB
Ariel Ace/Taunt/Thunder Wave: Ace is for coverage, while Taunt or Thunder Wave are for a prankster set.
Like previously stated, this set combos extremely well with a regenerator Meinshao, and it also makes a fairly decent lead/scout.