The following are known Action Replay Codes for Knockout Kings 2000 on Nintendo 64 (N64).

Device Compatibility: Action Replay & GameShark

Max Power
810637460064

Max Speed
8106374a0064

Max Stamina
8106374e0064

Infinite Creation Points
810637420064

Player 1: Infinite Health
8106b97442c8
8106b9760000

Player 2: Infinite Health
8106ba7c42c8
8106ba7e0000

Player 1: No Health
8106b9740000
8106b9760000

Player 2: No Health
8106ba7c0000
8106ba7e0000

Player 1: Max Power
8106b9800000
8106b9820bb2

Player 1: No Power
8106b9800000
8106b9820000

Player 2: Max Power
8106ba880000
8106ba8a0bb2

Player 2: No Power
8106ba880000
8106ba8a0000