Yeah, that didn't even work 100%. It's no good for changing the order over 150, and a Pokemon can't be assigned two Pokedex numbers or else it won't show up in the dex, so you can't even change the order to include a Pokemon outside of the Kanto dex because you won't be able to change its original number, do you understand?
Maybe I should make a tutorial on that. It wouldn't be too difficult, and I don't think there's anything that really covers it, though I don't think there's ever any real need for it since most folk just enable the National dex and leave it as is. Plus it'd be time consuming to go and edit all the dex entries as well, haha.