Diancie-Mega @ Diancite  
Ability: Magic Bounce  
EVs: 248 HP / 8 Atk / 252 Spe  
Jolly Nature  
- Stealth Rock  
- Substitute  
- Endeavor  
- Diamond Storm  

Volcarona @ Iapapa Berry  
Ability: Flame Body  
EVs: 252 SpA / 4 SpD / 252 Spe  
Modest Nature  
IVs: 0 Atk  
- Quiver Dance  
- Bug Buzz  
- Fire Blast  
- Hidden Power [Ground]  

Landorus-Therian (M) @ Rockium Z  
Ability: Intimidate  
EVs: 252 Atk / 4 SpD / 252 Spe  
Adamant Nature  
- Earthquake  
- Stone Edge  
- Swords Dance  
- Rock Polish  

Magearna @ Iapapa Berry  
Ability: Soul-Heart  
EVs: 248 HP / 72 Def / 188 SpA  
Modest Nature  
IVs: 0 Atk  
- Focus Blast  
- Calm Mind  
- Ice Beam  
- Thunderbolt  

Victini @ Choice Scarf  
Ability: Victory Star  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- V-create  
- Bolt Strike  
- U-turn  
- Trick  

Serperior @ Iapapa Berry  
Ability: Contrary  
EVs: 56 HP / 220 SpA / 232 Spe  
Timid Nature  
IVs: 0 Atk  
- Defog  
- Leaf Storm  
- Taunt  
- Glare