PSP emulation: GPSP coding.

[JXDNOVA1]

So I have a PSP and got the GPSP installed into it. However I tried to get some of cheats working and didn't have much luck in getting them to work. For example, Megaman Zero 3 I tried to get the Omega Zero code to work and didn't have any luck with it. Can someone get me a code that they may have and the process they went about getting him to play on the GPSP? Also is there any other other GBA emulators that exist that would work better for coding?