Lucario
In the Pokémon Adventures manga, like in games, it appears under the ownership of Riley who was on a boat heading to the Battle Frontier. Diamond meets Riley at Iron Island, and Byron asks Riley to help Diamond sharpen his Pokémon battle skills before Diamond goes to Lake Verity. In Pokémon Diamond and Pearl Adventure! the main character, Hareta, gained a Riolu egg which hatched into a Riolu later on in that chapter and then evolved in to Lucario.