First you have to unlock the other six characters by beating the game with certain characters, gotta unlock, Dan, Sakura, Fei Long, Cammy, Rose, and Gen. after that you must beat the game with 2 perfects and 2 ultra finishes without any continues, after defeating seth you must defeat akuma. make sure you dont go over 2 ultra finishes or else you fight gouken and you can't unlock him until you unlocked akuma first
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First you have to unlock the other six characters by beating the game with certain characters, gotta unlock, Dan, Sakura, Fei Long, Cammy, Rose, and Gen. after that you must beat the game with 2 perfects and 2 ultra finishes without any continues, after defeating seth you must defeat akuma. make sure you dont go over 2 ultra finishes or else you fight gouken and you can't unlock him until you unlocked akuma first