I got an idea!
Carracosta
252 Att/252 Spe/4 Def
Jolly/ Adamnt Nature
Sturdy
Salac/Leichi berry
Aqua Jet
Shell Break
Waterfall/ Aqua Tail
Rock Slide/Stone Edge
Yep, know where cooking. Depending whether you want power, speed or accuracy, this turtle is a walking behemoth. Use SS smash on the first turn and see what happens. If, or when you get hit, Your Sturdy will let you live, and then the berries kick in. A Carracosta can get a 5+ boost instead of +2, depending on whether you like attack or speed. If you fear a Priority move, try your luck with Aqua jet to see if you can knock it out before it knocks you out. Or at least injure it somewhat.
EDIT: Pinch berries aren't out yet, but hey! a set to look forward too!