Staka 1 (Stakataka) @ Life Orb  
Ability: Beast Boost  
EVs: 252 HP / 252 Atk / 4 SpD  
Lonely Nature  
IVs: 15 Def / 0 Spe  
- Trick Room  
- Stone Edge  
- Earthquake  
- Gyro Ball  

Mag (which one?) (Magearna) @ Leftovers  
Ability: Soul-Heart  
EVs: 252 HP / 252 SpA / 4 SpD  
Quiet Nature  
IVs: 0 Atk  
- Volt Switch  
- Fleur Cannon  
- Heart Swap  
- Trick Room  

Ray (Rayquaza-Mega) @ Choice Scarf  
Ability: Delta Stream  
EVs: 252 Atk / 4 SpA / 252 Spe  
Hasty Nature  
- V-create  
- Surf  
- Draco Meteor  
- Dragon Ascent  

Palkia @ Life Orb  
Ability: Pressure  
EVs: 248 HP / 252 SpA / 8 SpD  
Quiet Nature  
IVs: 0 Atk / 0 Spe  
- Trick Room  
- Focus Blast  
- Spacial Rend  
- Hydro Pump  

Mew @ Focus Sash  
Ability: Synchronize  
EVs: 252 HP / 252 Def / 4 SpD  
Relaxed Nature  
IVs: 0 Atk / 0 Spe  
- Stealth Rock  
- Spikes  
- Magic Coat  
- Trick Room  

Necrozma-Dusk-Mane @ Weakness Policy  
Ability: Prism Armor  
EVs: 252 HP / 252 Atk / 4 SpD  
Brave Nature  
- Trick Room  
- Earthquake  
- Rock Blast  
- Sunsteel Strike