Necrozma-Dusk-Mane @ Weakness Policy  
Ability: Prism Armor  
EVs: 248 HP / 200 Def / 60 Spe  
Impish Nature  
- Morning Sun  
- Dragon Dance  
- Earthquake  
- Sunsteel Strike  

Rayquaza-Mega @ Sky Plate  
Ability: Air Lock  
EVs: 64 HP / 252 Atk / 44 Def / 40 SpD / 108 Spe  
Adamant Nature  
- Dragon Dance  
- Dragon Ascent  
- V-create  
- Extreme Speed  

Yveltal @ Heavy-Duty Boots  
Ability: Dark Aura  
EVs: 252 HP / 4 Def / 252 SpD  
Calm Nature  
IVs: 0 Atk  
- Foul Play  
- Snarl  
- Defog  
- Roost  

Eternatus @ Firium Z  
Ability: Pressure  
EVs: 184 HP / 80 SpA / 196 SpD / 44 Spe  
Calm Nature  
IVs: 0 Atk  
- Toxic Spikes  
- Flamethrower  
- Sludge Bomb  
- Recover  

Arceus-Water @ Splash Plate  
Ability: Multitype  
EVs: 248 HP / 220 Def / 40 SpD  
Bold Nature  
IVs: 0 Atk  
- Safeguard  
- Recover  
- Judgment  
- Toxic  

Groudon-Primal @ Red Orb  
Ability: Desolate Land  
EVs: 4 Atk / 252 SpA / 252 Spe  
Naive Nature  
- Precipice Blades  
- Stone Edge  
- Solar Beam  
- Eruption