https://techcrunch.com/2017/12/06/pokemon-go-gen-iii-this-week/

Good news, Pokèmon Go fans: Gen III Pokemon are landing this week

Or, I should say, more Gen III Pokémon are landing this week. Niantic tells me that at least 50 new Pokèmon will be added to the game before the week is over, adding to the handful of Gen III monsters that showed up just before Halloween.