Maybe there's some sort of thing where you do something in Sonic Adventure 2 and then SSB:M reads the memory card and if you have done the thing, you get sonic as a character
or maybe there's something else like that for some other game...
I dunno... but y'know kinda like the thing in MGS... if you have castlevania data on your memory card, Phycho Mantis says like "Ahh... you like Castlevania don't you?" heh heh...
but I doubt it
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