How do I unlock the last cup in Gran Prix?

#1SuperShadowAcePosted 12/27/2012 7:40:44 PM
I already got the A-cup trophy for the first 4.
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#2DeeNinjaaPosted 12/27/2012 8:39:28 PM
I assume you need to beat all GP's on S-class, which is unlocked once you beat the 5th world tourr.
#3SuperShadowAce(Topic Creator)Posted 12/27/2012 11:05:39 PM
Anyone have solid info on it?
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