Although the rumors about it surfaced back in April, it took a while for Niantic to finally confirm the arrival of the fourth-generation Pokemon from the Sinnoh region. However, the details are still not out yet, but Pokemon GO players should get ready to capture Turtwig, Piplup, Chimchar — or at least one or two of them.
https://www.notebookcheck.net/Pokemon-GO-to-get-fourth-generation-Pokemon-and-many-minor-tweaks-in-the-near-future.337826.0.html