Following Krobelus advice, I'm making my own thread on this since the other seems to be dead. I plan on doing all regions from the GB/GBC/GBA/NDS games (not mystery dungeon or pokemon rangers, although I might get to those later).
All regions must be in GBA style and fidel to their original versions (those who have already an official gba look - Kanto, Hoenn, Sevii Archipelago)
The other 3 are the Orange Archipelago, Johto and Sinnoh which will have to be made based on the anime (Orange Archipelago, except for the islands which did not show up on the anime, those can be made up), Johto (based on GSC) and Sinnoh (based on NDS).
I'm starting with Johto, then move on to the Orange Archipelago and Sinnoh, only later will I "copy" the other regions to RMXP.
If you want to help just follow the rules and you will get on the "team", which right now is just me.
I don't agree with the orange islands. That is a non-game mapped thing and people should map it out on their own. Otherwise, it saves time instead of having 100 people do different regions, emphasis can be put on other things, like storyline or graphic-friendly pokemon.