57e47233_and_Secrets_for_3DS___GameFAQs__How_to_Unlock
[Unlockable] Quarter Up [How to Unlock] 
Fight 30 opponents via Arcade Fight Request. It's be easy with the right bait, hee hee.
Super Street Fighter IV: 3D Edition Cheats, Codes, and Secrets for 3DS - GameFAQs