This'd be a seperate board under the Pokemon forums heading.
Here, people are allowed to make their own fan group for specific pokemon, like the Eeveevolutions, Fire-types, Pokemon that can truly fly, etc.
Of course, there should be a sticky thead showing all of the currently active groups.
This is pretty popluar over at Pokecommunity, so why not do them here?
(unless Pokecommunity has the idea copyrighted...)