Firstly, I hope this is the right thread.
I'm studying software development in school, and I want to get into ROM hacking. Eventually I'd like to make a full hack, but I figured I'd try to walk before I run. I want to try adding areas like hidden grottos to HGSS, then maybe work my way up to an oasis/hidden town of sorts.
Does anyone know if this is possible? Can I use SDSME to make it happen, or am I going to have to get creative? I've tried to find info online and in these forums but can't find anything for gen4. It looks like AdvancedMap can be used for GBA title, which I COULD do, but Heart Gold is my favorite title. That's why I want to start there.