Intimidate: Lowers the opponent's attack by one stage.
Sand Rush: Doubles speed in a sandstorm and eliminates sandstorm recoil.
Scrappy: Allows user to hit Ghost-types.
Overview: All these abilities are very useful, Intimidate for a set up set, Scrappy for a sweeping set (especially against Mr. Infamous Gengar), but Sand Rush comes out on top for sweeping set and revenge killing.
Quick killing Stoutland:
EV: 252 attack, 72 special defense, 72 defense, 112 speed (if you want complete sweeping potential, max speed and attack, for an amazing 518 speed within sandstorms)
Items: Life Orb/Choice Band
This is probably one of the best Stoutland sets there is, and Stoutland itself is a good Pokemon. With those pretty okay defenses, he can take hits, but likely is 2HKO by powerful shots. But, if in a Sandstorm, Stoutland is EXTREMELY fast, and unable to taken down, unless for a Mach Punch from Conkeldurr. This moveset allows him to have decent defenses, a 492 base attack stat, and (if in a sandstorm) an amazing 448 base speed, which outspeeds a LOT of things. His only downfall is his not really GREAT attack power. But Stoutland's potential is cool!