The Team Medallion (Japanese: チームへんこう メダリオンTeam Change Medallion) is an item in Pokémon GO to be introduced on February 26, 2019 . It's a single-use item that allows a player to change teams. It is available in the Shop for 1,000 and can only be purchased once every 365 days.
A unique coin that enables a Trainer to change teams. A Team Medallion can only be purchased from the shop once per 365 days. Confirmation: You will not be able to purchase another Team Medallion for another 365 days. Your Pokémon currently defending Gyms won’t earn PokéCoins when they’re defeated.