Does anyone know of a way to use Action Replay codes on an M3? I've tried using EFA's AR Crypt and Converter to make a cheat.dat file, but the codes just get messed up and the M3 can't use them.

Use visual boy advance to use the cheats then save. and put the rom onto the flash card with the cheats already used.

Yes, but that would involve me having to find the codes on my own. Also, AR can produce some much more elaborate cheats.

Sorry for the bump before anyone notices it.

I thought gameshark was ar?

You can use gameshark codes off the internet

Certain versions of AR codes are compatible up with GS until ARv3 if I recall. So it doesn't really matter unless their ARv3 codes.