Choice Scarf Ramparados doesn't work, so this may be a viable option. If you are to set this up, try out these sets:
Rampardos @ Choice Band
Ability: Mold Breaker
EVs: 252 HP / 252 Atk / 4 Def
Brave Nature
IVs: 0 Spe
- Head Smash
- Crunch
- Double-Edge
- Protect
Cresselia (F) @ Magnet
Ability: Levitate
EVs: 4 HP / 252 Def / 252 SpD
Relaxed Nature
IVs: 0 Spe
- Trick Room
- Psychic
- Charge Beam
- Protect
Try this out, it's a great idea! Hope I helped and good luck!