The following are known Action Replay Codes for Ready 2 Rumble Boxing: Round 2 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

Have 50000 cash
BED6399A
0000C350

1 punch to knockout player 1
AF2392EE
00000001

Unlimited endurance player 2
6F7BA834
00000064

Unlimited energy player 2
5A77B422
00000064

1 punch to knockout player 2
5A77B422
00000001

Maximum rumble power player 2
ED47DBE1
00000150

No losses in champ mode
7075D015
00000000

Maximum rumble power player 1
6DDBA83E
00000150

Constant 50000 cash
BED6399A
0000C350

unlimited energy player 1
AF2392EE
00000064

unlimited endurance player 1
D1C840A0
00000064

No lossses in champ mode
7075D015
00000000