Lucario (ルカリオ, Rukario?) is a humanoid Pokemon and is based on a member of the canine family like a Jackel.
See Lucario (SSBB) for fighter info.
In Super Smash Bros. Brawl
On January 21 2007, a promotional video for Super Smash Bros. Brawl on the official Wii website was posted that showed a Groudon sticker being highlighted and the faces of Pikachu, Pokémon Trainer, Lucario, and Jigglypuff to show that the sticker can be used to power-up these four characters in the Subspace Emissary. This is essentially confirmation that Lucario will be a playable character in the game. This video can be viewed here.