Team GO Leader Sierra is one of the hardest challenges a trainer can take on in Pokemon GO this May 2025, but you can gain an advantage on her by using the best counters. Team GO Rocket has long been a pain in trainers sides in Pokémon GO, but there are a host of rewards for defeating them. This is especially the case for the three Leaders Cliff, Arlo and Sierra, making it worthwhile to try and take them down this month.
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