Rayquaza-Mega @ Choice Band  
Ability: Mold Breaker  
EVs: 252 Atk / 4 SpD / 252 Spe  
Lonely Nature  
IVs: 0 Def  
- Dragon Ascent  
- U-turn  
- Trick  
- Extreme Speed  

Deoxys-Speed @ Focus Sash  
Ability: No Guard  
EVs: 248 HP / 8 Def / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Sheer Cold  
- Trick  
- Spore  
- Entrainment  

Diancie-Mega @ Safety Goggles  
Ability: Pixilate  
EVs: 152 HP / 252 Atk / 4 Def / 100 Spe  
Adamant Nature  
- Stealth Rock  
- Extreme Speed  
- Fake Out  
- Thousand Arrows  

Scizor-Mega @ Shed Shell  
Ability: Wonder Guard  
EVs: 248 HP / 8 Atk / 252 Def  
Relaxed Nature  
- Aromatherapy  
- U-turn  
- Spikes  
- Spiky Shield  

Latios-Mega (M) @ Soul Dew  
Ability: Levitate  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Spacial Rend  
- Oblivion Wing  
- Volt Switch  
- Psystrike  

Blissey (F) @ Choice Scarf  
Ability: Imposter  
EVs: 248 HP / 252 Def / 8 SpD  
Bold Nature  
IVs: 0 SpA  
- Skill Swap  
- Parting Shot  
- Fake Out  
- Stealth Rock