I have not bought the game yet but it does look fun. I understand why game freak didn't add all the pokemon into this game. This is NOT a console device it is still a handheld like all the other pokemon series were made for. You can not give game freak a hard time because they picked out the most used and liked pokemon people voted on.
Do you guys know how much data it'll take to add all the pokemon into a handheld device? A LOT! Pokemon let's go kind of pushed me away from pokemon but I do understand it was meant for pokemon go and nothing else. I have played every single series of pokemon and they do change things for the better or worst, because it is meant to stay in the range of 12 year olds. That's why Ash is forever 12.