Starting this January, Pokémon Go is hosting a special monthly event it calls Community Days. Here special Pokémon with exclusive moves will pop up more often for a few hours. Players will also get access to increased XP or Stardust and Lure Modules will be up for three hours. For the first Community Day happening this January 20th, the Pokémon up for grabs will be Pikachu with an exclusive event move Surf. Yes, you get a chance to get a surfing Pikachu. You can check out what time Community Day is happening in your area through this link.
Source: Engadget