At the main menu, select Options, and then select Cheats. At the Cheats screen, enter the following codes to unlock the corresponding cheat. If you entered the cheat correctly, you'll see the cheat name highlighted.

Press [SQ], [X], [C], [SQ], [X], [C]
Press [C], [SQ], Down, Left, [C], [SQ]
Press [Circle], [Square], [Down], [Lef, [Circle], [Square] at the cheat menu.

Press [Square], [X], [Circle], [Square], [X], [Circle] at the cheat menu to get unlimited spirit energy for player one. Repeat this code to disable its effect.

Successfully complete Dark Tournament episode 6.
Successfully complete Dark Tournament episode 7.
Successfully complete Dark Tournament episode 30.
Successfully complete survival mode as Ichigaki.
Win a token game match with Chu's card in your deck.
Defeat Doctor Itchigaki in story plus mode.
Defeat Younger Toguro without him activating his "strength increase" in single player mode under the hard difficulty setting.
Select Touya as your final opponent in arcade mode and win.
Defeat Jin with a "Perfect" in Dark Tournament episode 23.
Defeat Karasu as Yoko Kurama in survival mode.
Select Makintaro as your final opponent in arcade mode and win.
Complete Dark Tournament mode under the easy difficulty setting.
Select M1 as your final opponent in arcade mode and win.
Defeat Hiei and Kurama in tag team mode with M1 and M2 on your team.
Complete Dark Tournament mode under the easy difficulty setting.
Win two "Perfect" rounds in single player mode under the hard difficulty setting.
Destroy 75% of the arena floor in any mode with one player.
Complete Dark Tournament mode under the easy difficulty setting.
Defeat Genkai as Yusuke in the cave in single player mode under the hard difficulty setting.
Successfully complete survival mode as Shishi.
Successfully complete the game in story mode.
Successfully complete Dark Tournament mode under the easy difficulty setting.
Successfully complete Dark tournament episode 31.
Win five consecutive fights.
Select Bui as your final opponent in arcade mode and win.
Defeat Younger Toguro in Dark Tournament mode episode 2.
Win a tag team battle against five opponents as Hiei.
Select Kurama as your final opponent in arcade mode and win.
Successfully complete training mode against Kuwabara as Kuwabara.
Select Younger Toguro as your final opponent in arcade mode as Yusuke and win.
Defeat Yusuke in any mode.
Successfully complete Dark Tournament episode 21.
Successfully complete Dark Tournament episode 13.
Successfully complete Dark Tournament episode 30.
Successfully complete Dark Tournament episode 22.
Select Younger Toguro as your final opponent in arcade mode and win without losing any rounds.