well, first of all, you need to go through all the doors in spaceship emissary. there are also trophies you need to collect (try doing the difficulty on very hard, or intense to get a trophey of the bosses). there are also three additional characters that you can unlock after beating tabuu. Jigglypuff, Toon link, and Wolf. to unlock these characters, you need to go through a special door. Wolf is in the level titled: the ruins, Toon Link is in The Forest (i think), and Jigglypuff is in The Swamp. after doing that, I think you'll get a 100% in subspace emissary. if not, then check www.gamefaqs.com for information. I think they have faq's for how to beat subspace emissary on 100%
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Its in the forest level in the subspace emissary mode only appears after beating the mode.
Sonic will appear during the final battle in the Subspace Emissary
you can`t.
Beat the subspace emissary.
Those are stickers, and they're used to power up your characters in the Subspace Emissary. You can find them randomly in the Subspace Emissary, and they also appear in versus matches.