Gyarados @ Mystic Water  
Ability: Moxie  
EVs: 252 Atk / 4 SpD / 252 Spe  
Adamant Nature  
- Dragon Dance  
- Waterfall  
- Ice Fang  
- Power Whip  

Gyarados @ Heavy-Duty Boots  
Ability: Intimidate  
EVs: 252 HP / 4 Atk / 252 SpD  
Careful Nature  
- Waterfall  
- Rapid Spin  
- Life Dew  
- Thunder Wave