The Pokémon GO Special Anniversary Pikachu Celebration event is now underway and runs through July 20, giving Trainers more chances to catch Pikachu in a variety of festive costumes. The event features three themed celebrations centered on different costumed Pikachu, increased wild spawns of Pikachu and boosted opportunities to encounter Shiny Pikachu. Additional event bonuses and themed activities are also available, making this a fitting celebration of Pokémon GO’s 10th anniversary.
Source: Official Pokémon GO blog and Pokemon.com
Source:Pokémon
