Kellyn is a Pokémon Ranger in Pokémon Ranger: Shadows of Almia.
In the Games
He can played in Shadows of Almia if you chose to be a boy. He is actually from the Fiore region but he hopes to become a Pokémon Ranger that is why he moved to Almia.
In the Anime
He appears in the Anime to aid Ash to help a Riolu that can use Aura Sphere. This Riolu is also in the game.