I've been using a double dance set and it has been working pretty well for me
Zygarde @ Lum Berry
Ability: Aura Break
EVs: 252 Atk / 104 Spd / 152 HP
Adamant Nature
- Dragon Dance
- Coil
- Stone Edge
- Earthquake
The speed EV's allow it to outpace Greninja at +1 and kill it with Earthquake.