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 Special Evolutions – How To Get Pangoro, Sylveon, Glaceon, Aromatisse, Slurpuff, Sirfetch'd, Galarian Cofagrigus And More
How to get & use Metal Coat in Pokemon Go - Dexerto
Pokemon Scarlet and Violet Metal Coat Location: How to evolve Scyther into Scizor
Pokemon GO: How To Get Metal Coat
Pokémon Go: How To Use Metal Coat to evolve Scyther into Scizor
Pokémon Go Metal Coat - evolve Scyther into Scizor, Onix into Steelix, and how to get the Metal Coat
Pokemon Sun PDF, PDF, Pokémon
Pokémon Go: How To Use Metal Coat to evolve Scyther into Scizor
Pixelmon Mod
Pokémon Go Metal Coat - evolve Scyther into Scizor, Onix into Steelix, and how to get the Metal Coat
Pokemon Go Metal Coat: How to evolve Scyther and Onix