Grimmsnarl @ Light Clay  
Ability: Prankster  
Tera Type: Steel  
EVs: 248 HP / 252 Def / 8 SpD  
Impish Nature  
- Reflect  
- Light Screen  
- Parting Shot  
- Play Rough  

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

Necrozma-Dusk-Mane @ Ultranecrozium Z  
Ability: Prism Armor  
Tera Type: Psychic  
EVs: 224 Atk / 32 Def / 252 Spe  
Adamant Nature  
- Dragon Dance  
- Photon Geyser  
- Earthquake  
- Stone Edge  

Gyarados-Mega @ Gyaradosite  
Ability: Intimidate  
Tera Type: Water  
EVs: 252 Atk / 4 Def / 252 Spe  
Jolly Nature  
- Dragon Dance  
- Taunt  
- Crunch  
- Earthquake  

Xerneas @ Power Herb  
Ability: Fairy Aura  
Tera Type: Fighting  
EVs: 180 Def / 252 SpA / 76 Spe  
Modest Nature  
IVs: 0 Atk  
- Geomancy  
- Moonblast  
- Focus Blast  
- Hidden Power [Rock]  

Eternatus @ Power Herb  
Ability: Pressure  
Tera Type: Dragon  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Dynamax Cannon  
- Sludge Bomb  
- Fire Blast  
- Meteor Beam