Gyarados-Mega @ Gyaradosite  
Ability: Intimidate  
EVs: 32 HP / 252 Atk / 224 Spe  
Adamant Nature  
- Dragon Dance  
- Waterfall  
- Earthquake  
- Stone Edge  

Aggron-Mega @ Aggronite  
Ability: Sturdy  
EVs: 240 HP / 64 Def / 204 SpD  
Relaxed Nature  
IVs: 17 Spe  
- Heavy Slam  
- Taunt  
- Metal Burst  
- Fire Punch  

Gardevoir-Mega @ Gardevoirite  
Ability: Trace  
EVs: 208 HP / 232 Def / 48 SpA / 20 Spe  
Bold Nature  
IVs: 0 Atk  
- Psyshock  
- Encore  
- Hyper Voice  
- Hyper Beam