This is my Choice Scarf set, perfect for revenge killing and Moxie boosts:
Krookodile (M) @ Choice Scarf
Ability: Moxie
EVs: 4 HP / 252 Atk / 252 Spe
Adamant Nature
- Outrage
- Earthquake
- Crunch
- Stone Edge / Brick Break
The Choice scarf makes this guy fast enough to KO pretty well any hurt opponent, and you get stronger from Moxie with every opponent you KO, making it a devastating sweeper.
Outrage has phenomenal neutral coverage with high power, and it locks you in anyway, so it is pretty good with the Scarf.
Earthquake has STAB, and it hits Steel types that resist Outrage, not to mention 4 other types, it is kind of a no-brainer.
Crunch is also STAB, and it hits just as hard as Outrage without the confusion, it just doesn't have the neutral coverage.
The next slot is preference, Stone Edge is more powerful and accurate, as well as having a high crit ratio, while Brick Break has a really strong coverage with Crunch.
EVs go into Attack and Speed, just because it is a sweeper, while Nature boosts attack, since Scarf boosts speed. Moxie allows choiced attacks to just get stronger and stronger as Krook wipes out the opposing team.