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
How to get Magnetic Lure Modules in Pokemon Go: Evolution guide
Pokémon Go Lures, from Golden Lure to Rainy Lure, Glacial Lure
Pokemon Scarlet and Violet Metal Coat Location: How to evolve
Pokémon Go Metal Coat - evolve Scyther into Scizor, Onix into Steelix, and how to get the Metal Coat
Pokémon Go: How To Use Metal Coat to evolve Scyther into Scizor
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Pokémon Go Metal Coat - evolve Scyther into Scizor, Onix into Steelix, and how to get the Metal Coat
Pokemon GO: Lure Module Evolution List - All Lure Evolutions
Metal Coat - Pokemon GO Guide - IGN
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Pokémon GO: How to Get Metal Coat