Volcarona @ Psychium Z  
Ability: Flame Body  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Quiver Dance  
- Fire Blast  
- Psychic  
- Hidden Power [Ground]  

Latios @ Choice Scarf  
Ability: Levitate  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Draco Meteor  
- Psyshock  
- Defog  
- Roost  

Landorus-Therian @ Leftovers  
Ability: Intimidate  
EVs: 252 HP / 240 Def / 16 Spe  
Impish Nature  
- Stealth Rock  
- Earthquake  
- Hidden Power [Ice]  
- U-turn  

Lopunny-Mega @ Lopunnite  
Ability: Limber  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Return  
- High Jump Kick  
- Ice Punch  
- Fake Out  

Celesteela @ Leftovers  
Ability: Beast Boost  
EVs: 252 HP / 132 Def / 124 SpD  
Relaxed Nature  
- Leech Seed  
- Protect  
- Heavy Slam  
- Flamethrower  

Greninja-Ash @ Choice Specs  
Ability: Battle Bond  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
- Water Shuriken  
- Hydro Pump  
- Spikes  
- Dark Pulse  

or

Heatran @ Leftovers  
Ability: Flash Fire  
EVs: 212 HP / 44 Def / 252 Spe  
Timid Nature  
- Magma Storm  
- Earth Power  
- Taunt  
- Toxic