Set the difficulty to 7 or 8 stars and clear Super mode without losing a round ... When you start your fight press START on the controller 2. Then select for the second player the same figther ...
Press Start once (for Dhalsim, Ken, Ryu, Sagat, Vega and Zangief) for their Super Street Fighter 2 versions. Press Start 2x for Chun-Li. Note that all characters have 2 colors (P or K) but Chun-Li ...