I'm not sure which game I'll start with anymore, but I plan for whatever my first game to be all Gen 7 Pokemon, then in my other game I plan on doing a playthough with one Pokemon from each gen, and another playthough I'll do an Alolan form playthrough or maybe the other way around.
Not sure what Starter I'll start with, but using what we know so far, depending on the Starter I pick:
Rowlett, Rockruff, Grubbin/Cutiefly/Wimpod, Sandygast, Wishiwashi/Pyukumuku, Salandit
Litten, Rockruff, Grubbin/Cutiefly/Wimpod, Sandygast, Fomantis, Wishiwashi/Pyukumuku
Popplio, Rockruff, Grubbin/Cutiefly, Sandygast, Fomantis, Salandit
So far, Rockruff is the only Pokemon that makes it difficult to decide which game I'll play first because I want to use both Lycanroc, I'm using it regardless though. I love all the Bugs this time, Grubbin's line the most but uncertain if I want to go with Cutiefly or Wimpod instead for possibly seeing the evolution the first time while playing(Assuming Cutiefly has another evolution). Everything else are just favorites and want to avoid type overlap(Which is why I wont use Wimpod/Wishiwashi/Pyukumuku if I used Popplio).
I'd wait and see for the full dex to decide what team I'll use for an all Gen team, but for the Gen 7 Pokemon I'll use one of the Starters I didn't use. The other 6 I'll probably just use a favorite but I'd like to maybe use something I haven't used before or rarely used. I'd be rotating my team as well so I can use 7 Pokemon.
For the Alolan team I'll use one of the Starters still so I can use all three in the end, as for the 5 slots left, it'll be better if I knew more but for now Sandshrew/Vulpix, Raichu, Marowak, Meowth, and Exeggutor, again, wanting to avoid type overlap. Small selection to choose from right now though, so probably end up different depending how many more come out.
So I have basically only have 5 teams planned out over the course of three playthroughs. Figured I probably shouldn't over plan this time around... :3