The following are known Action Replay Codes for Soul Fighter on SEGA Dreamcast (Dreamcast). These codes were also known as GameShark Codes and in most cases will work on both devices.

Device Compatibility: Action Replay & GameShark

No time limit for weapon
42A21A71
0000009F

Special Power Bar always full
840B88B8
00000090

Saved 99 souls
6EFB6EF9
00000063

Infinite Time
E7971D23
000000FF

Infinite Health
59D772EF
00000064