In all seriousness though, I would not have downloaded the app if it was full of newer Pokémon I didn't recognize from my youth. XD I haven't played Pokémon since Silver because my parents wouldn't buy more for me as a kid, and I couldn't afford to keep up with the series in college. Niantic and Nintendo were smart to only have the original 150 to ensure the widest appeal. Maybe a future update could introduce more, which would be okay with me.
i think its a really awful opinion and he's clearly entitled to it, but in general i do agree that keeping the game to the original 151 at release is a really smart move both because of how recognizable they are, and also because of how long they'll be able to milk the game. if they release pokemon generations at a stable rate (i.e once a year or once every six months), it gives players a good amount of time to catch what's available before getting overwhelmed, and it gives the game a much longer life that way