Mewtwo-Mega-Y @ Mewtwonite Y  
Ability: Pressure  
Tera Type: Psychic  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Nasty Plot  
- Psystrike  
- Aura Sphere  
- Ice Beam  

Yveltal @ Life Orb  
Ability: Dark Aura  
Tera Type: Dark  
EVs: 252 SpA / 4 SpD / 252 Spe  
Modest Nature  
IVs: 0 Atk  
- Dark Pulse  
- Oblivion Wing  
- Taunt  
- Heat Wave  

Groudon @ Red Orb  
Ability: Drought  
Tera Type: Ground  
EVs: 156 Atk / 100 SpD / 252 Spe  
Jolly Nature  
- Rock Polish  
- Swords Dance  
- Precipice Blades  
- Stone Edge  

Koraidon @ Choice Scarf  
Ability: Orichalcum Pulse  
Tera Type: Fighting  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Dragon Claw  
- Close Combat  
- Flare Blitz  
- U-turn  

Ho-Oh @ Heavy-Duty Boots  
Ability: Regenerator  
Tera Type: Grass  
EVs: 248 HP / 204 Def / 56 SpD  
Impish Nature  
- Sacred Fire  
- Toxic  
- Defog  
- Whirlwind  

Necrozma-Dusk-Mane @ Leftovers  
Ability: Prism Armor  
Tera Type: Grass  
EVs: 252 HP / 68 Def / 188 SpD  
Impish Nature  
- Stealth Rock  
- Sunsteel Strike  
- Toxic  
- Morning Sun