Gyarados-Mega @ Lum Berry  
Ability: Huge Power  
Shiny: Yes  
EVs: 252 HP / 252 Atk / 4 Def  
Adamant Nature  
- Sucker Punch  
- Pursuit  
- Knock Off  
- Water Shuriken  

Arceus @ Spooky Plate  
Ability: Mold Breaker  
EVs: 40 HP / 252 SpA / 216 Spe  
Modest Nature  
IVs: 0 Atk  
- Shell Smash  
- Boomburst  
- Judgment  
- Dark Void  

Groudon-Primal @ Mental Herb  
Ability: Mold Breaker  
Shiny: Yes  
EVs: 240 HP / 252 Atk / 16 Spe  
Adamant Nature  
- Spore  
- Shell Smash  
- Thousand Arrows  
- King's Shield  

Xerneas @ Leftovers  
Ability: Wonder Guard  
Level: 98  
EVs: 248 HP / 8 Def / 252 SpA  
Quiet Nature  
IVs: 0 Spe  
- Stealth Rock  
- Substitute  
- Moonblast  
- Baton Pass  

Sableye-Mega @ Flame Orb  
Ability: Wonder Guard  
Level: 2  
Shiny: Yes  
EVs: 76 HP / 76 Atk / 76 Def / 156 SpD  
Relaxed Nature  
IVs: 0 Atk / 0 Spe  
- Curse  
- Aromatherapy  
- Pain Split  
- Defog  

Rayquaza-Mega @ Choice Scarf  
Ability: Shadow Tag  
EVs: 252 Atk / 4 Def / 252 Spe  
Naive Nature  
- Dragon Ascent  
- Steam Eruption  
- Bolt Strike  
- Gunk Shot