Ultra Street Fighter II came out a short while ago for the Switch and a new secret was just revealed.
Capcom has revealed that Shin Akuma can actually be unlocked in Ultra Street Fighter II: The Final Challengers.
The process to unlock him is as follows.
1. Select Ryu, cancel on Color 1
2. Select Ken, cancel on Color 9
3. Select Sagat, cancel on Color 8
4. Select M. Bison cancel on Color 7
5. Place the cursor on Random, press L & R at the same time
Capcom revealed this at Comicon today.