People are telling he is cheap as hell and will just steal your FM. That event ended. As the others have stated he's also a hidden boss in arcade but you don't get the specail title for beating him that the event. Shin Akuma - Rounds must be set to 1. Get at least 1 perfect and don't use a continue. You'll fight him after Seth and you HAVE to beat him.
SNK 2: Millionaire Fighting on the Dreamcast, GameFAQs has 15 Unlock Boss Battle Mode, Beat both Shin Gouki and God Rugal in the Arcade Mode. Those who breached Story Mode in Tekken 7 accessed a special fight where you battle Shin Akuma, a powered up, much cheaper version of.