The following are known Action Replay Codes for Ready 2 Rumble Boxing: Round 2 on Nintendo Game Boy Advance (GBA).

These are Action Replay Version 3 (V3) Codes.

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

(m)
461a2fda
5648ea72
0d734e98
5c495f0c

Inf Health
2078e028
f453e885

Inf Stamina
2eed9543
bca7e444

Always Max Rumble
8caec2a8
9213e2a6

Freeze Round Timer
8e9ed456
96e826c1

1 hit to KO p2
3555fd4a
bedfeb9f

AR Button for Slow
dbba3a89
4cb74b94