Lucario's debut and video game appearance is in "Pokémon Mystery Dungeon: Blue Rescue Team" and "Red Rescue Team", though it only appears as a Statue Cameo when the player gets 15,000 points and the Lucario rank. It then appeared in "Pokémon Diamond" and "Pearl", where its pre-evolved form, Riolu, can be obtained as an egg from Riley. Riolu evolves into Lucario when it reaches a sufficiently high level of happiness. Lucario is used by notable trainers Maylene, the third Sinnoh Gym Leader; a tag team partner known as Riley; Cynthia, Sinnoh's Elite Four Champion; and by Bruno, an Elite Four member of Johto. In ' Lucario is perceived as the greatest rescue leader of all time, and his adventures have become legendary. After reaching a certain number of points, a Lucario statue will be displayed outside the rescue base. While the player never meets Lucario, Alakazam tells the player that his goal is to become closer to Lucario's greatness. Lucario can be found and befriended in Lost Wilderness dungeon in ' "," but it has no particular main role. However, in "Pokemon Mystery Dungeon Explorers of Sky" and "Pokemon Super Mystery Dungeon", its pre-evolution form Riolu may be played as the main character or be chosen as the partner Pokemon. Lucaio appears as a boss Pokémon in ', as the guardian of the Blue Gem. Lucario is one of the few Pokémon in "Pokémon X" and "Y" that can use the new Mega Evolution mechanic while holding Lucarionite, its Mega Stone; doing so results in it Mega Evolving into Mega Lucario in the process. Lucario also appears as an NPC in ' and its sequel, "".