Lucario (Japanese: ルカリオ) is a Fighting/Steel-type Pokémon and the title character of the eighth Pokémon movie, Lucario and the Mystery of Mew. His Japanese voice actor is 浪川大輔 Daisuke Namikawa, and his English voice actor is Sean Schemmel. He is able to communicate in human language via telepathy.

Hundreds of years ago, before the invention of Poké Balls, Lucario served Sir Aaron, who in turn served Rene, the queen of Cameron Palace. Lucario and Aaron were sensitive to aura (Japanese: 波導 wave guidance), invisible vibrations that all objects, especially living things, release. This enabled them to "see" objects and living creatures and predict the actions of others even with their eyes closed. Lucario could use aura as an offensive attack in the form of Aura Sphere, in which he would amass a sphere of energy and hurl it at an opponent. Aaron taught Lucario how to refine his sensitivity to aura.

When Cameron Palace was about to be caught in the middle of a war, Aaron was on his way to the Tree of Beginning to attempt to stop the battle when he came across Lucario, who had been temporarily blinded by a group of sand-kicking Houndoom. Aaron knew that Lucario was unaware of the two armies rampaging toward him and would be virtually defenseless, so he threw his staff, sealing Lucario within. The armies raged past the staff, and Aaron's Pidgeot later returned it to Rene. After sealing Lucario, Aaron sacrificed himself to the Tree of Beginning to stop the war, and he succeeded.

Years later, in the present time, Lucario was awoken from the staff when it was held by Ash Ketchum, who has a similar aura pattern to Aaron. Lucario initially mistook Ash for Aaron, and was stubborn and distrustful of humans after being sealed in the staff. Unaware of Aaron's sacrifice, Lucario held a grudge toward Aaron, thinking Aaron had abandoned the castle and him. He had considered himself Aaron's servant, and he could not understand the friendship between Ash and Pikachu. However, a time flower message left by Aaron shortly before his death told Lucario the truth, that Aaron considered Lucario a friend, not a servant.

Once again the Tree of Beginning was disturbed, threatening to destroy the balance between Pokémon and nature. Ash and Lucario rushed to its core and began to use their aura to energize the tree's defense system. Using up their aura would have meant the same fate as Aaron- death. However, just as Ash was about to use up his aura, Lucario pushed him away, instead sacrificing only himself to the tree.

After Lucario's death, the portrait of Aaron in Cameron Palace was altered to include Lucario by Aaron's side, cementing their relationship as best friends and partners in aura manipulation.

Attacks used

• Aura Sphere

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For more information on this Pokémon's species, see Lucario.