https://www.gamespot.com/articles/pokemon-go-adds-a-bunch-of-new-gen-3-pokemon-today/1100-6456283/

Pokemon Go players now have a bunch of new Pokemon to add to their collections. Developer Niantic has added another batch of monsters from the Hoenn region to the popular mobile game, all of which can be found out in the wild beginning today, January 23.

This new batch consists of 23 more Pokemon that originally appeared in the series' third-generation titles, Pokemon Ruby and Sapphire. Niantic hasn't specified which monsters have been added, but the developer shared a new piece of key art that features Aggron, Flygon, Lunatone, Solrock, Camerupt, and several other Pokemon.