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https://pokemonblog.com/2021/01/16/evolve-machoke-during-machop-pokemon-go-community-day-or-up-to-two-hours-after-the-event-to-get-a-machamp-that-knows-payback/
Evolve Machoke during Machop Pokémon GO Community Day or up to two hours after the event to get a Machamp that knows Payback