Wailmer

Wailmer is a Water-type Pokémon from the Hoenn region. It evolves into Wailord when fed 400 candies.

Trivia

 * Along with Magikarp, Swablu, Larvesta, Skrelp, Noibat and Meltan, Wailmer is one of the Pokémon that needs 400 candies to evolve which is the largest amount of candies to evolve in the game.