Eternatus @ Black Sludge  
Ability: Pressure  
EVs: 252 HP / 232 SpD / 24 Spe  
Timid Nature  
IVs: 0 Atk  
- Dragon Pulse  
- Meteor Beam  
- Cosmic Power  
- Recover  

Groudon @ Leftovers  
Ability: Drought  
EVs: 252 HP / 252 Atk / 4 SpD  
Adamant Nature  
- Bulk Up  
- Dragon Tail  
- Precipice Blades  
- Rest  

Blissey (F) @ Utility Umbrella  
Ability: Natural Cure  
EVs: 252 HP / 4 Def / 252 SpD  
Calm Nature  
IVs: 0 Atk  
- Soft-Boiled  
- Seismic Toss  
- Aromatherapy  
- Confide  

Yveltal @ Heavy-Duty Boots  
Ability: Dark Aura  
Shiny: Yes  
EVs: 252 HP / 244 SpD / 12 Spe  
Careful Nature  
IVs: 0 Atk  
- Foul Play  
- Taunt  
- Defog  
- Roost  

Tangrowth @ Rocky Helmet  
Ability: Regenerator  
EVs: 252 HP / 252 Def / 4 SpD  
Relaxed Nature  
- Giga Drain  
- Tickle  
- Synthesis  
- Earthquake  

Necrozma-Dusk-Mane @ Rocky Helmet  
Ability: Prism Armor  
Shiny: Yes  
EVs: 252 HP / 228 Def / 28 Spe  
Impish Nature  
- Stealth Rock  
- Sunsteel Strike  
- Earthquake  
- Morning Sun