All right...let me think! Okay! Here are the best ideas I could think of, although they might be hard!
1. World Map INFO changer
2. GS scripting program (I know it would be hard, but GS hackers would worship you if you could do it!)
3. A sprite editor (I know there's already one, but it's not that great...)
4. A trainer editor (Like PET or something!)
Anyway, I have a question: Does the wild pokemon editor edit places like New Bark Town or indoor places? If not, could you add that feature!
Thanks!