Jirachi @ Choice Scarf  
Ability: housekeeping  
EVs: 248 HP / 48 Def / 84 SpA / 128 Spe  
Timid Nature  
- U-turn  
- Moonblast  
- Hidden Power [Fire]  
- Healing Wish

Jirachi @ Leftovers  
Ability: housekeeping  
EVs: 248 HP / 152 SpD / 108 Spe  
Calm Nature  
- Moonblast  
- Wish  
- U-turn  
- Stealth Rock

Jirachi is an amazing hazard removing pivot, able to keep up momentum and keep hazards off the field consistently with Housekeeping. Perfect for anyone using a more offensive team or needs pivoting ability rather than Chansey's bulk.
Other Options-
Scarf: Flash Cannon, Hidden Power [Ground], Trick
Defensive: Healing Wish, Hidden Power [Fire], Toxic, Thunder Wave, Magic Coat