Complete the 1-Player game with all 8 of the standard characters, and play on all 8 stages in Versus Mode.
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You don't unlock him! If you unlock Sonic and play as him, Super Sonic is his final smash.
you can unlock mushroom kingdom if you beat master hand with all the charicters then play in all the areas and mushroom kingdom will be in your area place. Also, there's an unlockable mode in the options: That's right, the items switch!(100 vs matches)
No,but you can unlock super sonic
Sorry. you can't unlcok him in super smash flash. But look somewhere if he is in one of the Super Smash Flash 2 versions and unlock him. Good luck :-)
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