https://techcrunch.com/2017/10/17/images-hidden-in-pokemon-go-suggest-new-pokemon-might-appear-around-halloween/

If you’re still poking around Pokémon Go, there’s a good chance you’ve caught most of what’s available by now.

Good news! It seems Niantic is getting really, really close to adding Gen 3 (or “Hoenn”) Pokémon to the game. Some of them, at least.