https://www.gamespot.com/articles/pokemon-go-players-can-now-catch-a-special-pikachu/1100-6457013/

February 27 is Pokemon Day, and like last year, Niantic is celebrating the occasion by giving players a chance to capture a rare Pokemon in Pokemon Go. For the next few days, players will be able to encounter a special Pikachu, which will come with an exclusive move it cannot typically learn in the mobile game.

From now until 1 PM PT / 4 PM ET on February 28, players will have a chance to capture a Pikachu wearing a party hat, similar to the one available during last year's Pokemon Day celebration. This time around, however, the party hat Pikachu will know the move Present.