Uber team

Xerneas @ Power Herb
Ability: Fairy Aura
EVs: 248 HP / 252 SpA / 8 SpD
Modest Nature
IVs: 0 Atk
- Moonblast
- Thunderbolt
- Geomancy
- Hidden Power [Ground]

Magearna @ Sitrus Berry
Ability: Soul-Heart
EVs: 252 HP / 80 SpA / 172 SpD
Serious Nature
IVs: 0 Atk
- Heart Swap
- Flash Cannon
- Dazzling Gleam
- Thunderbolt

Arceus-Water @ Splash Plate
Ability: Multitype
EVs: 252 HP / 252 Def / 4 SpA
Bold Nature
IVs: 0 Atk
- Recover
- Judgment
- Defog
- Toxic

Groudon-Primal @ Red Orb
Ability: Desolate Land
EVs: 252 HP / 56 Atk / 200 SpD
Careful Nature
- Roar
- Stealth Rock
- Precipice Blades
- Fire Punch

Lunala @ Choice Scarf
Ability: Shadow Shield
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Moongeist Beam
- Moonblast
- Ice Beam
- Psychic

Lucario-Mega @ Lucarionite
Ability: Justified
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Swords Dance
- Close Combat
- Bullet Punch
- Iron Tail