Pokemon Wishlist gives the staff a general idea of what people are after as well, so much easier in that regard.
Basically, post what Pokémon you're hoping your character will be able to obtain throughout their journey in the Kanto region! It can be anything, however, please note that chances are you will not be able to get everything you want. Just because it's posted here doesn't mean it's a guarantee you're going to get it, it's just to give the staff an idea.
This especially goes for legendaries and shinies/odd colours, both of which are only rarely given out, if ever for the legends.