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There is no existing tutorial for editing the badges of any game.
The way to do it is to find the image of the badges using unLZ.GBA (it's a single sprite), and then modify that one to replace the old images. It's the same process you would use to modify any other image in the game. Also, Emerald has both the Hoenn and Kanto badges included, so make sure you replace the Hoenn badges.
Thanks a bunch :)
Alright, sounds easy enough, I should be able to do that. Maybe someone should consider making a tutorial sometime. I just wanted one because I thought I would have to go through as much of a hassle as I did while replacing the world map. But knowing it's this simple. I'm pretty thankful ^_^