Serperior @ Leftovers  
Ability: Contrary  
EVs: 248 HP / 8 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Substitute  
- Leech Seed  
- Protect  
- Leaf Storm  

Charizard-Mega-Y @ Charizardite Y  
Ability: Drought  
EVs: 208 HP / 108 SpA / 116 SpD / 76 Spe  
Modest Nature  
IVs: 0 Atk  
- Toxic  
- Blast Burn  
- Air Slash  
- Solar Beam  

Haxorus @ Choice Scarf  
Ability: Unnerve  
EVs: 252 Atk / 4 SpD / 252 Spe  
Adamant Nature  
- Outrage  
- Superpower  
- Iron Tail  
- Poison Jab