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

Metal Coat - Pokemon GO Guide - IGN

Nintendo Power 2000) - Pokemon Gold & Silver

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Pokemon GO Metal Coat: How to Get, Use & More

How to get the metal coat!

Wouldn't the iron sphere attract the treasure? : r/Tombofannihilation

Pokemon GO: Lure Module Evolution List - All Lure Evolutions

How to Get a Metal Coat in Pokémon Go: 3 Simple Ways

How to Get a Metal Coat in Pokémon Go: 3 Simple Ways

How to get a Metal Coat in Pokemon Go: Scizor and Steelix evolution guide - Charlie INTEL

Pokemon GO: Lure Module Evolution List - All Lure Evolutions