To add some more utility to the Metal Coat (it can only be used on Syther and Onix), it could also be sed to evolve the Pokemon that evolve via Magnetic Lure

Pokemon Go Metal Coat: How to evolve Scyther and Onix

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Pokémon Go Metal Coat - evolve Scyther into Scizor, Onix into Steelix, and how to get the Metal Coat

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