There are a lot of fan-made Pokemon Game/ROM hacks out there that are great all-around adventures.

Significantly shorter load and save times. New, faster Script Editor with syntax highlighting and built-in search features. Fixed lots of problems with Japanese DP roms [either not loading or only ...

To get started with a mod, choose the "Create Mod" option. You will have to provide it with an unchanged rom to base the mod on. From there click on the mod that appears in the list and start editing.