Rayquaza-Mega @ Choice Specs  
Ability: Mold Breaker  
EVs: 92 Def / 252 SpA / 164 Spe  
Modest Nature  
IVs: 0 Atk  
- Draco Meteor  
- Aeroblast  
- Volt Switch  
- Searing Shot  

Rayquaza-Mega @ Choice Scarf  
Ability: Huge Power  
EVs: 252 Atk / 88 Def / 168 Spe  
Adamant Nature  
- Dragon Ascent  
- Thousand Arrows  
- Petal Blizzard  
- Close Combat  

Rayquaza-Mega @ Sky Plate  
Ability: Aerilate  
EVs: 252 HP / 252 Atk / 4 Spe  
Adamant Nature  
- Fake Out  
- Extreme Speed  
- Sacred Fire  
- Spikes  

Rayquaza-Mega @ Shed Shell  
Ability: Magic Bounce  
EVs: 252 HP / 200 Def / 56 Spe  
Timid Nature  
IVs: 0 Atk  
- Scald  
- King's Shield  
- Recover  
- Defog  

Blissey (F) @ Shed Shell  
Ability: Wonder Guard  
EVs: 252 HP / 252 Def / 4 SpD  
Relaxed Nature  
IVs: 0 Spe  
- Wish  
- Parting Shot  
- Whirlwind  
- Aromatherapy  

Xerneas @ Leftovers  
Ability: Wonder Guard  
EVs: 248 HP / 176 SpA / 84 Spe  
Modest Nature  
- Magic Coat  
- Substitute  
- Moonblast  
- Baton Pass