How do you get knuckles on super smash brothers brawl?

Answer 1

Simply unlock sonic then go to coin launcher and wait until the knuckles trophy appears when it does shoot it to get it or obtain it through the subspace emissary mode or maybe if your lucky Celebi will drop it when you get him.

Answer 2

There are four ways you can do so; the first three of which you have to defeat Sonic in a battle to unlock him:

1) Play 300 matches.

2) Beat Classic Mode with 10 characters.

3) Play 10 or more hours of Brawl matches.

4) Have Sonic join you in the Subspace Emissary.

Answer 3

Its a Hack

Answer 4

By level up and getting new charters and lands