Nihilego @ Black Sludge  
Ability: Sand Stream  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Sassy Nature  
- Spectral Thief  
- Revelation Dance  
- Shore Up  
- Volt Switch  

Diancie-Mega @ Choice Specs  
Ability: Pixilate  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Rash Nature  
- Boomburst  
- Revelation Dance  
- Extreme Speed  
- Magma Storm  

Chansey @ Eviolite  
Ability: Imposter  
Happiness: 0  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe  
Bold Nature  
- Metal Burst  
- U-turn  
- Shore Up  
- Whirlwind  

Zygarde-Complete @ Groundium Z  
Ability: Magic Bounce  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Careful Nature  
- Defog  
- Thousand Waves  
- Spectral Thief  
- Shore Up  

Mewtwo-Mega-X @ Toxic Orb  
Ability: Poison Heal  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD / 252 Spe  
Jolly Nature  
- Low Kick  
- Knock Off  
- Purify  
- Spikes  

Slowbro-Mega @ Rocky Helmet  
Ability: Prankster  
EVs: 252 HP / 252 Atk / 252 Def / 252 SpD  
Relaxed Nature  
IVs: 0 Spe  
- Haze  
- Anchor Shot  
- Shore Up  
- Strength Sap