It depends what set you're running.
If you're running a Dragon Dance set, Jolly.
Scrafty @ Lum Berry
Ability: Moxie
EVs: 252 Atk, 252 Speed, 4 HP
Nature: Jolly
- D-Dance
- Drain Punch/ High Jump Kick
- Crunch/ Knock Off
- Ice Punch
If you're running a Bulk Up tank set, Careful.
Scarfty @ Leftovers
Ability: Shed Skin
EVs: 252 HP, 252 Sp. Def, 4 Def
Nature: Careful
- Bulk Up
- Rest
- Crunch
- Drain Punch