I suggest Gyarados. Its stat's are:
The move set that i suggest would be:
Gyarados (M) @ Leftovers
EVs: 252 Atk / 4 SDef / 252 Spd
Jolly Nature (+Spd, -SAtk)
Lastly, you can use this tool to help you find Pokemon in the future: http://pokemondb.net/pokedex/all
I hope this helps you with your choice in Pokemon!