Mega-Lucario is a Fighting and Steel type Mega Pokémon. This is Lucario's Mega-Evolution.
Mega-Lucario was revealed in the CoroCoro Comics magazine in September 2013, along with Mega-Mewtwo Y, Mega-Ampharos, Mega-Blaziken, Mega-Mawile and Mega-Absol.
As Mega Lucario, its cream fur becomes longer, and its thighs slim down. It develops more spikes on the back of its paws, which have turned crimson. It also develops spikes on both of its feet, which have become crimson too. Its previously red eyes are now orange-colored. Its aura-sensing appendages grow longer, and two of them are tipped in crimson. Its shoulders also possess a spike each. Its aura heightens throughout its body, which formed black markings on its blue fur.
In Kalos, Mega Lucario is believed to be the first discovered Mega Evolution. People call Mega Lucario's fighting style heartless due to it being bathed in the explosive energy of Mega Evolution, awakening its combative instincts and causing it to not show any mercy to any of its opponents.