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One of the most gigantic Legendary Pokémon, Eternatus, has made its debut in Pokémon GO, but the requirements to get this strange beast are different than you might expect. Unlike other Legendary Pokémon, Eternatus does not appear naturally, instead demanding players meet a specific goal to unlock it. Even when caught, Eternatus doesn't follow traditional rules, refusing power-ups unless you have a multitude of the right resources.


Source: https://screenrant.com/how-to-get-eternatus-pokemon-go/