The special announcement from Niantic on December 12/13 not only came with the 2016 Holiday Event, it has introduced the first of the Generation 2 Pokémon. These are the Pokémon that first appeared in Pokémon Gold and Silver.
You might have noticed that the Christmas Holiday Pokemon GO event is underway. For a limited time, it’s possible to catch Holiday Pikachu, who wears a Santa hat. It has been confirmed that if you evolve your Christmas Pikachu into a Raichu, it will still be wearing its Santa hat!