Most costumed Pikachu can be Shiny. These are among the rarest items for trading in the game.
When the first three Pokémon appear on your map, from them until they despawn and reappear. Repeat this process four times . PokГ©mon GO Pikachu
During specific events, taking snapshots of your Pokémon might trigger a "photobomb" where a wild Pikachu appears on the map for you to catch. Most costumed Pikachu can be Shiny
If you haven't started your journey yet, you can actually skip the standard starters (Bulbasaur, Charmander, and Squirtle) to get Pikachu : and Squirtle) to get Pikachu :