Shiftry @ Life Orb
Ability: Early Bird
EVs: 252 Attack, 56 Special Attack, 200 Speed
Nature: Naughty
Moveset:
-Fake Out
-Sucker Punch
-Leaf Storm
-Explosion
Kind of a gimmick set I came up a while ago. The idea of this set is to take out sweepers weakened by Stealth Rock, finishing of pokemon trying to set up, or revenge killing stuff as Gyarados and Salamence who have already taken a hit or two. The combination of Fake Out and Sucker Punch is nice, since Fake Out might as well do the extra damage you will need to OHKO with a STAB Life Orbed Sucker Punch coming from a base 100 attack stat.
200 Speed EVs makes 246 Speed, which makes you able of outspeeding Jolly Tyranitar so you can either hit it with Leaf Storm or just explode on it. It also has a few more speed EVs than standard Gallade, in case you want to explode on that instead or if you dont want to use Sucker Punch risking it using Swords Dance.
Leaf Storm will hit physical walls thinking you are fully physical, such as Gliscor, Donphan, Hippowdon, Vaporeon, Suicune, etc. Using Seed Bomb and going all physical is an option, but this could simply be outclassed by a Swords Dance set. Hidden Power Fire could also be an option, since this set completely gets walled by Steel types such as Registeel. Then again, this will make you unable to hit those other physical walls.
Explosion is some kind of last resort in case you're close to fainting, or if something like Snorlax tries to to scare you away.