Mewtwo-Mega-X @ Mewtwonite X  
Ability: Steadfast  
EVs: 252 Atk / 4 Def / 252 Spe  
Jolly Nature  
- Low Kick  
- Ice Beam  
- Stone Edge  
- Iron Tail  

Marshadow @ Choice Band  
Ability: Technician  
Hidden Power: Ice  
EVs: 252 Atk / 4 Def / 252 Spe  
Naive Nature  
- Spectral Thief  
- Low Kick  
- Shadow Sneak  
- Pursuit  

Arceus-Dragon @ Draco Plate  
Ability: Multitype  
EVs: 252 HP / 120 Def / 136 Spe  
Timid Nature  
IVs: 0 Atk  
- Defog  
- Recover  
- Judgment  
- Will-O-Wisp  

Groudon @ Red Orb  
Ability: Drought  
EVs: 252 HP / 56 Def / 200 SpD  
Relaxed Nature  
- Stealth Rock  
- Precipice Blades  
- Overheat  
- Toxic  

Magearna @ Leftovers  
Ability: Soul-Heart  
EVs: 252 HP / 4 Def / 252 SpD  
Calm Nature  
IVs: 0 Atk  
- Heart Swap  
- Fleur Cannon  
- Volt Switch  
- Heal Bell  

Yveltal @ Choice Scarf  
Ability: Dark Aura  
EVs: 32 Def / 224 SpA / 252 Spe  
Modest Nature  
- Foul Play  
- Dark Pulse  
- Oblivion Wing  
- U-turn