Lucario

Lucario is the 448th pokémon and is known as the Aura Pokémon. In the January 18th, 2008 update at Smash Bros. Dojo, Nintendo accidentally confired him, Ness, and Jigglypuff to appear in Super Smash Bros. Brawl. Since the only trace of Lucario is on that update, we don't know any specifics on him yet or even if he will appear on the Dojo or not.