Most people can't even finish one entire ROM mod, and that's with experience in coding/script-writing/map-editing/hex editing. Making three games is going to take you years to finish, especially if you don't know how to do any of those things, and especially if you want to modify the recent games like Diamond/Pearl.
I suggest you take programming classes so you do a lot of the editing yourself and don't have to rely on others to do most of the work. If you have to be waiting for a bunch of spriters and programmers, that's going to delay you indefinitely, and that's assuming you can find anyone at all who's willing to do that huge amount of work for free, or just to have their name in the credits, lol.
That said, I wish you a bunch of luck because I'd really like to see a good ROM mod! I'd like to see a mature storyline, not the boring pg-13 stories Nintendo is forced to give us so they don't "corrupt the minds of children across the planet with blood in video games", heh.
You know, I wish I could download the info from the brains of all the talented people making the games, I'd spend the rest of my life making awesome ROM mods and living off donations.