The following are known Action Replay Codes for Knockout Kings on Sony Playstation (PS1).

The codes should work with the region specified but may work for other regions as well.

Device Compatibility: Action Replay, CodeBreaker & GameShark

Max Health P1
801da5de0064
801da6060064

Max Health P2
801daf6a0064
801daf920064

Max Power P1
801da60c270f

Max Power P2
801daf98270f

Max Creation Points
800b0a7c0064
800c12ac0064
800b09e00064
800c12b00064
800b03500064
800c12b40064