The following are known Action Replay Codes for WWF Royal Rumble on SEGA Dreamcast.
Enable Vince McMahon
274778B400000001
Enable Shane McMahon
7E15C8F300000001
P1 Inf. Health
AC0B449600004396
D22096D800004396
P1 Inf. Specials
ECCF0D930000437A
P1 Inf. A+B Special
D29096D800004270
1A6CC39600014270
P1 Inf. B+X Special
CCE3F2FF00004270
FDA1438100014270
P1 Inf. X+A Special
ED3F0D9300004270
2DAFB64200014270
Stop Timer
C333E3F000000009
Extra Time
9C880EFF00007101
Enable Vince McMahon
274778B400000001
Enable Shane McMahon
7E15C8F300000001
P1 Inf. Health
AC0B449600004396
D22096D800004396
P1 Inf. Specials
ECCF0D930000437A
P1 Inf. A+B Special
D29096D800004270
1A6CC39600014270
P1 Inf. B+X Special
CCE3F2FF00004270
FDA1438100014270
P1 Inf. X+A Special
ED3F0D9300004270
2DAFB64200014270
Stop Timer
C333E3F000000009
Extra Time
9C880EFF00007101