>>3539
It's been over three years since I've done anything with it, so I don't remember much, but memory management is fun. Because everything in the game is so efficiently managed, if you want to do something as simple as add an extra note to some background music, you'd better be prepared to seriously shuffle things around. As far as I know, there's no single editing tool for G/S. There are shop, trainer, and Pokemon editors, sure, but past that, you kind of have to smash things together and hope for the best. When you start getting into text and event manipulation, map editing, and working with the day and night cycle, you wind up juggling decompilers, hex editors, and obscure, buggy, half-translated .exes from fourteen years ago.
Serious ROMhacking really makes you appreciate how much effort went into these early games, not to mention how much effort people put into making tools like Lunar Magic. It's one thing to make a good hack in terms of game design, but it's an entirely different beast to be able to crack into someone else's finished, not-intended-to-be-modified product, re-sculpt it into something cool, and have it not shit itself at runtime.