Gyarados

A very powerful pokemon, it is viewed by sailors as the most destructive thing in the world. It is shaped like a sea serpent, and is almost always seen with its mouth open. This pokemon is known as the insane twister, because of the multiple brain changes it goes through during evolution. You can ether evolve this pokemon from Magikarp, or catch one of them in Gyarados Lake, in the Hoenn region.