Okay. So I was given this link by a very helpful person on this forum: NVash. You are supposed to be able to use it to use gameshark codes.
" Now, there obviously is no dedicated way to actually insert codes into your game (at least nothing has been implemented yet)
However, there is a work-around for this. download VisualBoyAdvance for your PC. Grab your save from your sd card ("gametitle".sav), put it in the same directory as the game on your PC, and change the extension from ".sav" to ".sa1" (obviously without the quotes.)
Next step is to start the emulator on your PC, load up the game you want to insert code into, then hit file > Import > Battery File...
Select your .sa1 file, now you are playing the same game you are on your phone. VisualBoyAdvance has the ability to do Gameshark codes and Codebreaker codes. So insert whatever codes you like, save your game, rename the savefile back to having an extension with a .sav ending, and put the file back in the same directory as the game (on your phone).
Keep in mind that this is just for permanent modifier codes, so it only affects things like item quantity, key items, pokemon, etc., and after you save your game and transfer the save back to your phone, the codes will no longer be in effect, just what you changed when the codes were on.
(Also, excuse the poor English structure, I have a lot of percosets in my system right now and I'm not all really here. ) "
(How to use Gameshark/Codebreaker codes with Gameboid - Android Forums)
However, I cannot get it to work. I've tried asking, but the people there are not very nice. I now bring this information to all of you, in hopes that we can figure it out, and get it to work.
Almost forgot, the only thing I got out of him was that .sa1 files are the same as .sav files.... but whether that means we don't need to change it, I don't know. .sa1 files don't come up under import, so I'm not sure.
Lets figure this out together guys! Just think, Gameshark for the Droid!