The developers chose to do so most likely because they wanted an "update" on characters story-wise. Pikachu and and Jigglypuff stayed because they were very important in the series. Mewtwo, however, wasn't a main character, making him disposable. Besides, Lucario was a new Pokemon when Brawl was being developed and his signature move was visually similar to Mewtwo's, making an acceptable replacement and "upgrade".
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If you are telling to unlock lucario in super smash bros brawl then, finish target test and if you want to unlock lucario in ssf2 then.... you cannot unlock him
Sadly, no he isn't. Lucario was his replacement.
A Pokemon that is owned by Nintendo(c) that is based off of a jackal. Lucario is the aura Pokemon who makes an apperance in Pokemon Lucario and the mystery of mew and Super Smash Brothers Brawl.
It depends which Lucario you are talking about. Lucario have a 87.5% chance of being a male in the games. Lucario in the Lucario and the Mystery of Mew movie, is a male. Riley and Maylene's Lucario gender in the anime is unknown. Lucario's Codec information on Super Smash Bros Brawl refers to him as a male.
I believe that would be the triple jump. Like Zelda's teleporting and Snake's helicopter.