What you need to do is beat Tabbu and then after that get Wolf, Toon link and Jiggly puff. To get 100% you need to get as many trophies as you can. Get trophies from those blue and yellow boxes or turn your enemies into trophies.
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Sonic will appear during the final battle in the Subspace Emissary
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A boss in the Subspace Emissary (Adventure Mode in Super Smash Bros. Brawl)
You have to get on the level Subspace
yes if you go on youtube.