I believe you have to finish target test with all characters to unlock sound test if that doesn't work try to finish each test in a faster time then your previous time not only will you get the sheriff trophy but you should also get sound test if not then try getting high records in home run contest.
You can't, you can only unlock him in SSBB.
Unlock marth then use him to beat classic mode.
Finish the subspace emissary.
You can't unlock Shadow in SSBM. You can unlock Shadow in SSBB though, he is an assist trophy. In SSBB, you can use a texture hack on Sonic to make him look like Shadow and you can play as him.
too bad it doesnt exist
You can't
you have to do all star mode without continuing
All of them.
you don't unlock it. i mean how do you battle on it(tell me if I need action replay)
You really can't unlock Toad in SSBM. But you can be peach and use her B move and she will pull Toad out. And on adventure mode where you fight the Yoshi's Toad is running around in the background and by the flag there is a toad there too.
you can only unlock him in ssbb but if you have ssbb heres how to unlock him: beat classic mode 10 times but he does not just join you after you do this after you do this you have to beat him
Beat the adventure with jiggy puff, pickachu, and pichu