Look out for "Hat" Pikachus during Halloween, the Holiday season, and Pokémon Day.
Pikachu is the "King of Costumes" in Pokémon GO. Throughout the year, Niantic releases limited-edition versions that are highly sought after by collectors: PokГ©mon GO Pikachu
Most costumed Pikachu can be Shiny. These are among the rarest items for trading in the game. Look out for "Hat" Pikachus during Halloween, the
Check if your costumed Pikachu can evolve. Some event versions are locked, while others allow you to evolve them into a costumed Raichu. Pro-Tips for Pikachu Fans the Holiday season
If you haven't started your journey yet, you can actually skip the standard starters (Bulbasaur, Charmander, and Squirtle) to get Pikachu :