I use the Choice Scarf set.
Zangoose@Choice Scarf
Nature: Jolly (for ensured outspeeding)
EV: 252 Attack/Speed
1. Return
2. Close Combat
3. Pursuit
4. Elemental Punch
Note that you CANNOT have Night Slash+Elemental Punch, since Elemental Punch is Gen III Tutor move, and Night Slash is Gen IV Egg Move.