Danny posted the one I used against him and Strype in the 2v2 tournament. But Agility/Endeavor/Spore/Extremespeed @ Sash is probably more popular as you get the +2 speed boost, but I don't like it as opponent sashes and priority moves screw it up.
Salac Berry raises speed one stage so a 273 speed smeargle goes up to I think 409 speed, which will outspeed any sweeper without a boost or a fast scarf. Scarf Heracross for instance will be running adamant which maxes at 269 speed, so you'll be beating that which is the most common scarf pokemon. The salac berry means you can pretty much always get the baton pass off.