Gba Developement Question

[abeisgreat]

Ok, I know the gba is pretty well dead,but I am bored and I am looking to learn to make gba games and apps. So my main question is what compiler/language do i need to start this?

[Mr.Peanut]

Check out drunkencoders (http://drunkencoders.com).

[JKKDARK]

Ok, I know the gba is pretty well dead,

Game Boy Advance is not dead since official commercial games are still released.

[KiDD420]

How would one go about editing a game rom?