Fight against Shin Akuma
Win the game once with each character, except for
Pyron. Shin Akuma will appear after Pyron is defeated when using a
team containing your last set of characters.
Alternatively, win the game in Arcade Mode under any difficulty
setting, winning all rounds including those against Pyron. Also have
at least 2 Perfect finishes and at least one super combo finish in
each match. Shin Akuma will appear after Pyron is defeated.

Fight as Pyron
Defeat Pyron in arcade mode. *** You will also unlock his stage.

Fight as Shin Akuma
Defeat Shin Akuma in arcade mode.
Classic character sound themes:
Win the game to unlock classic themes for the
characters used in the "Sounds" option. To unlock Shin Akuma's
music, defeat Pyron as Shin Akuma.

PS2 Cheats for Capcom Fighting Evolution

Capcom Fighting Evolution cheat codes

Capcom Fighting Evolution cheats