Deoxys-Attack @ Focus Sash  
Ability: Pressure  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Psycho Boost  
- Ice Beam  
- Stealth Rock  
- Thunderbolt  

Necrozma-Dusk-Mane @ Weakness Policy  
Ability: Prism Armor  
EVs: 252 HP / 252 Atk / 4 Def  
Brave Nature  
IVs: 0 Spe  
- Sunsteel Strike  
- Earthquake  
- Photon Geyser  
- Trick Room  

Marshadow @ Focus Sash  
Ability: Technician  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Spectral Thief  
- Close Combat  
- Shadow Sneak  
- Endeavor  

Groudon @ Red Orb  
Ability: Drought  
EVs: 248 HP / 4 Def / 252 SpA / 4 SpD  
Quiet Nature  
IVs: 0 Atk / 0 Spe  
- Eruption  
- Earth Power  
- Flamethrower  
- Dragon Pulse  

Arceus @ Pixie Plate  
Ability: Multitype  
EVs: 248 HP / 4 Def / 4 SpA / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Judgment  
- Toxic  
- Refresh  
- Recover  

Gengar @ Gengarite  
Ability: Cursed Body  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Substitute  
- Sludge Bomb  
- Shadow Ball  
- Destiny Bond