Once it’s activated, you can encounter Arlo, Cliff, or Sierra at PokéStops or on Rocket Balloons. Defeating all three bosses enables you to finally face off against their boss, Giovanni.

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The Rocket bosses are a real challenge in Pokémon GO ... Ideally, you want Pokémon that can cover multiple potential Pokémon in Arlo's lineup. Here are all the Pokémon you might face and the best ...