We already talked about Pikachu Outbreak Event in Yokohama by The Pokemon Company. Niantic is supporting the event by creating to themed parks, one Kanto and one Johto.
As part of this great event, shiny Pikachu was spotted as you can see in pictures bellow. Shiny Pikachu is a little but more “tanned” than the normal one. See photos by some Yokohama Trainers:
Shiny Pikachu evolves into Shiny Raichu which is also a little bit more “tanned” than the normal one:
In the Yokohame events Raid Bosses are different:
Shiny Pikachu might be released worldwide after the event.