Yes so far the one thing noticed by most people have been the locatordex.
I can start compiling some of the data for each route etc in each game. I presume start with a map of RBY, map of Ruby and Sapphire. Maybe a separate map for Emerald. One for FireRed and Leafgreen and then one for Pearl, Diamond and Platinum??? Those are obvious. I don't know much about XD or anything do they have maps and the like? Even if they do, if we just focus on the main handheld games for each generation would likely be the best thing to do.
Edit: Just to clarify. This won't be actual HTML code or anything. Just simply going through each route, underground etc for each game and typing up the pokemon there what percentage they are, a note if a DS insert is necessary or if they're a swarm pokemon etc.