A Ton of codes which are good for a Code Breaker device on GBA.
In all instances you must add in and activate the Enable Code, which is the first one in the list, then just tap in any other codes you want to. The more codes you add, the greater the chance of the game not functioning as intended or crashing.
REGION: All Regions
Enable Code (Must Be On)
00009E1F 000A
1006FD98 0007
No Fog Of War 33003FCD 0000
Always Day 1 33004080 0001
50,000 G (Shop) 8200C420 C350
50,000 G (In-Battle) 820232C0 C350
Collect 1,000 Per Win 820232F8 03E8
Press B+Up To Activate Power Mode 74000130 03BD
820232DE 0101
Press B+Down To Activate Super Mode 74000130 037D
820232DE 0202
Max Stars 320232E1 00FF
320232E2 00FF
No Star..