Super Street Fighter 2 Revival is a port of Super SF2 Turbo for the Game Boy Advance (GBA), along with some new stages for the characters, multiple new modes, and Shin Akuma as a secret exclusive character (until Ultra Street Fighter 2: The Final Challengers came out for the Nintendo Switch, or the Dreamcast version if you mess with the settings a bit). Akuma and Shin Akuma in this version are unlocked by using VS points, which are collected by playing the game through it's various modes like arcade, vs, survival, etc. 5,000 VS points to unlock Akuma, 9,999 points for Shin Akuma. Akuma: Akuma lands 3 hits with his Rising Uppercut, like Ken does, but not having the opponent go into flames. Akuma has a air fireball unlike Ryu and Ken. Akuma has a true fireball like Ryu, which hits 3 times instead of one hit. Akuma has a teleport move, which allows him to move across the screen. He now has a Shun Goku Satsu, which wasn't in the original and home versions, unless you had the Dreamcast (by playing with the settings) or Nintendo Switch version (Ultra Street Fighter 2), were he had that move. Shin Akuma: A more powerful version of Akuma, he has the same moves as normal Akuma, but has the following: Air fireball move shoots 2 air fireballs instead of one. True fireball move deals the same amount of hits, but deals more damage. Shun Goku Satsu is faster and goes further. Teleport move is faster as well.
Ubisoft for porting SSF2 to the GBA