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https://pokemonblog.com/2020/11/20/you-can-now-evolve-magmar-during-pokemon-go-community-day-or-up-to-two-hours-afterward-to-get-magmortar-that-knows-thunderbolt/
You can now evolve Magmar during Pokémon GO Community Day or up to two hours afterward to get Magmortar that knows Thunderbolt