https://www.polygon.com/2019/1/14/18182729/pokemon-go-january-event-dates-hoenn-kyogre-groudon

Pokémon Go players can stock up on Pokémon from the Hoenn region this month as part of a two-week event in Niantic’s mobile game.

Starting on Jan. 15 at 1 p.m. PST, Pokémon from the Hoenn region will appear more often in the wild. That includes shiny versions of the Pokémon Taillow and Zigzagoon, and legendary Pokémon Kyogre and Groudon, who will be featured in Raid Battles. Shroomish evolved into Breloom can learn the move Grass Knot, while 7 km eggs will spawn Hoenn Pokémon. The event will come to an end on Jan. 29 at 1 p.m. PST.