From Bulbapedia, the community-driven Pokémon encyclopedia.
The Team 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's 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.
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