57e47233_and_Secrets_for_3DS___GameFAQs__How_to_Unlock
[Unlockable] From C to Shining C [How to Unlock] 
You think you're good, don't you? Prove it by ranking up all characters to C Rank against another player!
Super Street Fighter IV: 3D Edition Cheats, Codes, and Secrets for 3DS - GameFAQs