I am not sure, but I've heard that there isn't one. notice the 3d aspects of the Pokemon games. that would be extremely hard to make an editor for let alone actually editing it. Keep looking for one, I am.
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Look for the game on the internet.EX. Pokemon Yellow ROMJust type the game name in and type ROM after it
no.
There are lots of fun pokemon rom hacks, i would recommend pokemon light platinum, pokemon sienna (it's not a finished hack though) and pokemon ash gray :)
Download a SAFE ROM then a Rom reader.
Pokemon Light Platinum is a rom hack of Pokemon Ruby.