User blog comment:BMHKain/SEASON VI Hints./@comment-25656629-20151003235240/@comment-25968390-20151005012917

Also incorrect, but at least you unlocked a hint for this: Rock's foe comes from the same game as Akuma (Not counting the Alpha games), So he's from Street Fighter III, or IV; actually, the opponent in question only made a canon appearance in III.

Bottom Line: Rock's Foe is from Street Fighter III...