Shuckle @ Mental Herb  
Ability: Sturdy  
EVs: 252 HP / 252 Def / 4 SpD  
Bold Nature  
IVs: 0 Atk  
- Stealth Rock  
- Sticky Web  
- Encore  
- Final Gambit  

Diancie-Mega @ Diancite  
Ability: Magic Bounce  
EVs: 4 Def / 252 SpA / 252 Spe  
Timid Nature  
IVs: 1 Atk  
- Moonblast  
- Mystical Fire  
- Earth Power  
- Hidden Power [Grass]  

Terrakion @ Choice Scarf  
Ability: Justified  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Close Combat  
- Stone Edge  
- Earthquake  
- Poison Jab  

Nihilego @ Grassium Z  
Ability: Beast Boost  
EVs: 80 HP / 176 SpA / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Hidden Power [Fire]  
- Sludge Wave  
- Thunderbolt  
- Grass Knot  

Tyranitar @ Choice Band  
Ability: Sand Stream  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Pursuit  
- Crunch  
- Stone Edge  
- Fire Punch  

Stakataka @ Air Balloon  
Ability: Beast Boost  
EVs: 252 HP / 252 Atk / 4 SpD  
Lonely Nature  
IVs: 13 Def / 0 Spe  
- Gyro Ball  
- Heat Crash  
- Earthquake  
- Trick Room