Pokemon GO: How To Get Shiny Pikachu and Shiny Raichu wearing a Detective Hat

Pokemon GO keeps adding new events to the game, and new monsters and Shiny variants come with these events. Some of these Shiny monsters are Shiny Pikachu wearing a Detective Hat and Shiny Raichu wearing a Detective Hat. With the celebration of Detective Pikachu Returns, the developers at Niantic have offered a new event.