Check the Wiki for more information.
The long and short of it is, when I first learnt about ROM hacking these games were some of the first I thought it would be cool to add different things to. I sadly worked out quickly that they compress the ever living hell out of basically everything in the game, and it seems no one has bothered to document how... Until now. No promises anything near the state of Pokemon modding will come of this, but this is my little area of the internet where I like to share what I find about various projects.
If You Value What’s Left Of Your Head I Suggest You Stay Where You Are.
That's Quite A Move. I Must Find Out How He Does That.
You can take control of my mind and my body, but there's one thing a Saiyan keeps... HIS PRIDE!
Check out the following links if you're after more information about what I did to find out this information, especially the GBATek documentation.