The Lucario is a vibrant and powerful Pokemon, with a stunning cacophony of color. It has black and bright blue fur, a white chest, and a black "mask" with striking yellow eyes. Its muzzle is long and pointed, while its tail is slender and curved. Two small, pointed ears are also visible atop its head. On each hand, it has three fingers which it can use to focus its energy and perform incredible attacks, like Aura Sphere and Close Combat. When Lucario is filled with a fighting spirit, its fur glows an intense golden-yellow, making it an even more majestic sight from afar. Lucario evolves from Riolu and is able to understand the human language, as well as use its psychic powers to great effect.
When coloring this noteworthy pokemon, I would use shades of black for its fur, white and gray for its face and chest, yellow for its eyes and dark blue for its tail and ears. For the golden yellow, use a metallic gold and a bright yellow for the eyes. To bring out its details, use a light gray around its paws, cheek, and muzzle and a deeper black around its eyes, to give it a more menacing look. Finally, give its fur a soft gradient to make it sparkle when the light hits it.