https://www.polygon.com/2018/1/12/16883480/pokemon-go-community-days-january-2018-surfing-pikachu

Niantic is launching Pokémon Go Community Days, a monthly event where players are encouraged to go out and play the game together. Not only is it a good way to meet fellow trainers, but Niantic is also offering a special incentive for participants.

During Pokémon Go Community Days, players will have a few hours to find and capture a rare Pokémon. For the first event, which will run Jan. 20 from 11 a.m. to 2 p.m. PT, a Pikachu that knows the move Surf will be out in the wild. Lure Modules will also last a full three hours to help out trainers looking out for surfin’ Pikachu, and everyone will benefit from bonus experience points as well.