Magikarp

Magikarp is a Water-type Pokémon from the Kanto region. It evolves into Gyarados when fed 400 candies.

Trivia

 * Magikarp is the first Shiny Pokémon available in the game.
 * Magikarp is tied with Feebas for having the lowest maximum Combat Power of any Pokémon in Pokémon GO.
 * There is medal for catching extra-large Magikarp, called Fisher.