Thundurus @ Leftovers  
Ability: Prankster  
EVs: 236 HP / 76 SpA / 176 SpD / 20 Spe  
Calm Nature  
IVs: 2 Atk / 30 Def  
- Thunderbolt  
- Hidden Power [Ice]  
- Thunder Wave  
- Substitute  

Hitmontop @ Fighting Gem  
Ability: Intimidate  
EVs: 252 HP / 248 Atk / 8 Spe  
Adamant Nature  
- Close Combat  
- Fake Out  
- Feint  
- Wide Guard  

Jellicent (M) @ Sitrus Berry  
Ability: Water Absorb  
EVs: 252 HP / 100 Def / 156 SpD  
Sassy Nature  
IVs: 0 Atk  
- Scald  
- Will-O-Wisp  
- Recover  
- Trick Room  

Latios @ Dragon Gem  
Ability: Levitate  
EVs: 4 HP / 252 SpA / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Draco Meteor  
- Psychic  
- Tailwind  
- Protect  

Metagross @ Steel Gem  
Ability: Clear Body  
EVs: 244 HP / 252 Atk / 12 Spe  
Adamant Nature  
- Meteor Mash  
- Zen Headbutt  
- Bullet Punch  
- Protect  

Volcarona @ Bug Gem  
Ability: Flame Body  
EVs: 4 HP / 252 SpA / 252 Spe  
Modest Nature  
IVs: 0 Atk  
- Heat Wave  
- Bug Buzz  
- Quiver Dance  
- Protect