Unlocking him is not possible however you can play him due to a glitch i will try to explain it as best as possible. First of all if you want to actually control him put your controller in the 3rd port, second of all you know the area where names can be put into aka the name entry in the character select screen well here's what you need to do: Hold B and then press A on the name spot quickly before the game goes back to the main menu press A on NAME ENTRY if you pressed fast enough and kept holding B Masterhand will become your character. THIS TRICK WILL NOT WORK IF A PLAYER IS SELECTED.
I have no idea which game you are talking about, but for all three you need to use an action replay If you mean SSBM, you can use action replay but there's a glitch that saves time and money, you can look for it in Youtube
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 can't get master or crazy hand in ssbb but you can in ssbm and ssb. You can vs them in classic if you get up to masterhand under 9 minitues with no continues on hard both will appear at the end. Although it is said that they can be unlocked by beating boss mode with all characters. I hope I helped
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.