Dialga @ Choice Specs  
Ability: Pressure  
Tera Type: Steel  
EVs: 100 HP / 252 SpA / 156 Spe  
Modest Nature  
IVs: 0 Atk  
- Draco Meteor  
- Flash Cannon  
- Fire Blast  
- Trick  

Mewtwo-Mega-Y @ Mewtwonite Y  
Ability: Insomnia  
Tera Type: Psychic  
EVs: 40 Def / 252 SpA / 216 Spe  
Timid Nature  
IVs: 0 Atk  
- Psystrike  
- Fire Blast  
- Ice Beam  
- Nasty Plot  

Xerneas @ Power Herb  
Ability: Fairy Aura  
Tera Type: Electric  
EVs: 168 Def / 252 SpA / 88 Spe  
Modest Nature  
IVs: 0 Atk  
- Geomancy  
- Moonblast  
- Thunder  
- Defog  

Groudon @ Red Orb  
Ability: Drought  
Tera Type: Flying  
EVs: 240 HP / 28 Atk / 88 Def / 152 Spe  
Adamant Nature  
- Stealth Rock  
- Swords Dance  
- Precipice Blades  
- Stone Edge  

Zygarde @ Leftovers  
Ability: Power Construct  
Tera Type: Fairy  
EVs: 248 HP / 252 Def / 8 SpD  
Impish Nature  
- Coil  
- Glare  
- Thousand Arrows  
- Rest  

Ho-Oh @ Heavy-Duty Boots  
Ability: Regenerator  
Tera Type: Grass  
EVs: 248 HP / 208 Def / 52 SpD  
Impish Nature  
- Sacred Fire  
- Toxic  
- Defog  
- Whirlwind