I don't like unlocking characters through SSE (Subspace Emissary). That makes it way too easy. I like doing it the traditional way, which is completing a certain task and then fighting them to unlock them. But all I need now are Jigglypuff, Toon Link, and Wolf. All I need to do is complete the SSE and either find them through specific stages and fight them, or complete a certain challenge. Or I can just play up to 460 matches. I think that's the highest amount of Brawl matches to get all characters. And the only stage I need is the Great Sea, which is Toon Link's stage.
Also, I discovered a VERY cheap way to earn easy Brawl matches. I'm putting it in spoilers for those who don't want to be cheap.
[spoilers:1senhsra]Go to Special Brawl, set it to Stamina Flower Brawl, and set the computer's HP to 1.[/spoilers:1senhsra]
I only used this method once and that was to unlock R.O.B. because I really wanted him.