You have to beat the Broadway level on hard difficulty.
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To unlock Boss Battle Mode which is located in Stadium in Solo Mode you have to beat the Subspace Emissary.
2242w1
he is a battle card character so you can't unlock him
to unlock survival u must beat sim dragon i think. to unlock shenron, get all 7 dragon ballz To unlock story mode stories u need to beat certain stories
You just can't because silver isn't in sonic battle.