The Pokémon 30th Anniversary event runs in Pokemon GO from March 3 to 9, celebrating three decades of the franchise with a wide variety of returning Pokémon from past events. Trainers can also encounter Legendary Pokémon like Mewtwo, Articuno, Zapdos and Moltres, alongside other surprises. The event includes themed bonuses and special spawns that make catching and battling more rewarding. It’s a big week for fans looking to revisit classic Pokémon, add rare encounters to their collection and celebrate the series’ milestone in the game.
Source: Official Pokémon GO blog and Pokemon.com