The following changes have been made to Pokémon GO until further notice.
Rotating 1 PokéCoin bundles in the shop! New 1 PokéCoin bundles will be available in the shop each week as one-time purchases. The contents of these bundles change weekly, so be sure to get what is available each week. Right now, a new 1 PokéCoin bundle is available for you that contains the following.
Great Balls × 50
You can access the above bundle from now until Monday, April 27, 2020, at 1:00 p.m. PDT (GMT −7).
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—The Pokémon GO team