Magneton

Magneton's niche lies in its access to Magnet Pull, which allows it to trap and revenge kill the omnipresent Scizor. It can also reliably trap and remove key Steel-types in Klefki and Empoleon, which can open the door for teammates like Latias, Mega Altaria, and Nihilego to more easily sweep. Outside of trapping Steel-types, Magneton has decent offensive presence thanks to its high Special Attack, decent dual STAB coverage, and access to STAB Volt Switch. It can also utilize its decent defensive typing to pivot in on passive attackers like Florges and Togekiss if need be. Unfortunately, Magneton's niche is often offset by its pitiful bulk, which mostly prevents it from taking advantage of its useful resistances or reliably coming into play. This can complicate its ability to trap Scizor due to its fear of directly switching in, often requiring that it accomplish its role with support from a pivoting teammate or through aggressive double switching. This also hampers its ability to check many Pokemon most other Steel-types can handle, such as Latias and Nihilego. Magneton's poor defensive capabilities are further compounded by its weaknesses to common Ground-, Fighting-, and Fire-type moves, which are often run as coverage by several Pokemon it could otherwise pressure, like Mega Aggron, Mega Altaria, and Togekiss. Its Speed is also extremely poor for an offensive Pokemon, leaving it outsped by the vast majority of the offensive metagame without a Choice Scarf and by Pokemon like Mega Aerodactyl and Zeraora even with a Choice Scarf. These flaws often prevent Magneton from being able to reliably provide for its team outside of its role as a trapper, meaning it faces severe competition from other Electric-types with stronger defining characteristics and niches, like Rotom-H and Mega Manectric, and should usually never be run unless trapping Steel-types is desired, making it a very niche Pokemon.