Latios (M) @ Haban Berry  
Ability: Levitate  
EVs: 252 HP / 32 SpA / 32 SpD / 192 Spe  
Timid Nature  
IVs: 0 Atk  
- Draco Meteor  
- Surf  
- Calm Mind  
- Mystical Fire  

Diancie @ Weakness Policy  
Ability: Clear Body  
Shiny: Yes  
EVs: 252 HP / 108 Def / 148 SpD  
Sassy Nature  
- Diamond Storm  
- Moonblast  
- Trick Room  
- Encore  

Rillaboom @ Grassy Seed  
Ability: Grassy Surge  
EVs: 252 HP / 8 Def / 248 SpD  
Careful Nature  
- Leech Seed  
- Protect  
- Wood Hammer  
- Taunt