Magneton

Magnet Pull Magneton plays a unique role in ADV OU by trapping prominent Steel-type Pokemon like Skarmory, Forretress, Metagross, Jirachi, and opposing Magneton. Skarmory and Forretress are Magneton's primary targets, as they are potentially OHKOed by Thunderbolt or Hidden Power Fire and they give Magneton a free switch in when they are setting Spikes.

Magneton can do much more in a battle than trap Steel-types. For example, it can defensively check some threats, including Choice Band Salamence locked into Hidden Power Flying; Choice Band Metagross locked into Meteor Mash; Snorlax in sand lacking Earthquake or Fire Blast; and Choice Band Aerodactyl, Zapdos, and non-Fire Punch Gengar, albeit only once, with its many resistances. Additionally, Magneton can pressure some defensive teams with its sheer power combined with the threat of status: Thunderbolt threatens Suicune and Milotic, while Toxic forces out Blissey and Celebi, and the switch-in either takes a chunk from Thunderbolt or gets hit by a nasty status ailment.

Magneton's overall good defensive typing often gets overshadowed by its 4x weakness to one of the most common attacks in ADV OU: Earthquake. This weakness means that it will be OHKOed by most physical attackers, including Tyranitar, Metagross, Salamence, Swampert, Snorlax, Flygon, and Claydol. The weakness is especially exploited by Arena Trap Dugtrio, which can switch into Magneton's Thunderbolt and trap Magneton; to make things worse, Dugtrio is commonly used alongside Magneton's primary trap target, Skarmory, turning the trap into a one-for-one trade at best. Furthermore, offensive Skarmory can potentially outspeed and OHKO Magneton with Hidden Power Ground, while Forretress can sometimes survive Hidden Power Fire and OHKO back with Earthquake, which makes trapping these foes more difficult. Metagross and Jirachi at full health also generally win one-on-one against Magneton, meaning Magneton can't trap them without prior chip damage. Magneton's Fire- and Fighting-type weaknesses are also very relevant drawbacks, as they turn Moltres, mixed Salamence, and mixed Tyranitar into effective revenge killers.