Diancie-Mega @ Diancite  
Ability: Magic Bounce  
EVs: 4 Atk / 252 SpA / 252 Spe  
Hasty Nature  
- Moonblast  
- Diamond Storm  
- Protect  
- Earth Power  

Dragonite @ Heavy-Duty Boots  
Ability: Multiscale  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Earthquake  
- Thunder Punch  
- Roost  
- Dragon Dance  

Magnezone @ Choice Specs  
Ability: Magnet Pull  
EVs: 132 Def / 252 SpA / 124 Spe  
Modest Nature  
IVs: 0 Atk  
- Thunderbolt  
- Flash Cannon  
- Volt Switch  
- Hidden Power [Fire]