Pokemon GO Team Rocket Invasions Begin Now - GamePress

Stops appear to be taken over by grunts for 30 minutes, though there are some conflicting reports saying this timer can decrease after being defeated by another trainer.

Players who interact with these PokeStops will have the chance to fight, and then catch, a "Shadow Pokemon". Battles are done in Master League, though the teams you'll face should be pretty easy, despite the deceptively high CP.

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