Niantic confirmed today that Celebi is to be available available through Special Research in Pokémon GO on August 20th. This Special Research can be done once you have reached the third stage of the Mew Special Research. If you haven't finished the Mew Special Research you can do the Mew and Celebi ones at the same time. Players that already got a Celebi at the GO Fest and complete the Special Research will get additional candy to power up their Celebi. More Johto Pokémon will appear around the time of Celebi's appearance. Starting from today a Celebi T-Shirt is available for free in the Style Shop and some Pokémon HeartGold and Pokémon SoulSilver Trainer avatar items will also be available in the Style Shop, featuring outfits that unlock according to your Johto medal progress.