The following are known Action Replay Codes for Mega Man Battle Network 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)
f4ab517e
78a89921
db633c00
5b558138

Inf health
8326baec
c5943864

Cash
f7bf9c21
4f9db236

15 Chips
a1ecb687
dd73ba50

ARB for slow
dbba3a89
4cb74b94