Lucario is a fighting/steel type Pokemon and the evolution of Riolu. Lucario has the ability to manifest a special power called aura, which he can sense in all living beings. Aura can give insight to how a person is feeling and their morality. Lucario is just and will not take orders from an evil trainer. The more damage he takes, the more powerful his aura becomes. After the worlds collided from Galeems impact, Lucario hoped to bring balance to people's good auras and stop those with bad auras.