What makes you a good leader? Also, you're making an indie attempt, or are you going for a business? How much are you going to pay? And who are exactly "we"? (I mean, is there more people already involved? it should be nice to know about them -for the interested in helping you-). I would advice you to get your hands dirty on the development, unless you get that much help.
As for fakemons, you could add them, but after setting up the game and fixing the kit issues. Fans often just look for their official favourites. Any extra is just for fun, EVEN if they're well done and stuff. The region is nice however, but depending on what you want to do, you will encounter yourself remaking all the old regions for eternity... okay no, not eternity, but for a bunch of years.
Anyways, I'm sorry if I expressed myself badly or if I'm being rude, but I'm not good with words and way less on English (my native is Spanish), also I'm talking not knowing anymore than what you said, so I don't have any special background of your works nor your project.
Good luck,
OZ