I have a question. Is it possible to ban single abilities but keep the mon in the tier? Looking through the tiering info thread, I get the impression that Feraligatr only became really problematic after Sheer Force was introduced for it. With Magneton, other than it being pretty strong in general, it seems like the Analytic ability is the most problematic for people to handle, while the other two are rather niche in comparison. Unfortunately, I don't know how to simulate it going second in the damage calculator, otherwise I would provide calcs to support my claim.
Even if banning Analytic wouldn't solve the Magneton issue at hand, why hasn't this approach been taken when Sheer Force became so problematic with Gatr?
If this were applicable to Gatr, it would be applicable to any mon in any tier, examples include Azumarill, Espeon, Talonflame, Diggersby, Blaziken, Greninja, Tyranitar, Hippowdon, Excadrill, Alomomola, Dugtrio, Jolteon, etc... I can bring up enough examples to fit the entire damn page, and that would be far too many complex bans to feasibly keep track of, especially for beginner players, plus the whole concept of tiers would be skewed as a result.
I'm not convinced magneton is ban-worthy. EQ is very common coverage, and Magneton doesn't have the speed tier to stay in for long without getting revenge killed. Sure it can pressure a lot of mons and is hard to wall/switch in to, but so are a lot of other pokemon such as Sawk, Exeggutor, Magmortar, etc. The only thing that makes this mon even somewhat ban-able to me is its STAB volt-switch and access to a strong scarf set, although Scyther has these EXACT same options, just without the stealth rock weakness.
It would be a mistake to compare it to Heliolisk who had the speed tier, coverage, and power that made it such a threat, while Magneton has to CHOOSE between speed and power while possessing (debatably) worse coverage.
While Heliolisk and Magneton are not directly comparable, it is easy to draw parallels to each other: both gave the tier trouble due to the power of their Volt Switches, and how difficult they are to block. The powerful Volt Switch wore down switch-ins much faster than they can attempt to heal off the damage (Ferroseed being a great example here), while their access to powerful attacks to smack most Volt Switch absorbers meant that players are restricted in their available responses. The fact that feasible counters to Magneton (Lanturn, Stunfisk, Torterra, Quagsire) exist meant that Magneton is less broken than Heliolisk, but it has its own problematic qualities, mainly its sheer power and good defensive typing which grants it a good amount of switch-in opportunities, plus its stat distribution give it the ability to threaten any playstyle with the respective item (Scarf for offense, Specs for balance / stall, Eviolite is arguably an all-rounder tho it fares its best against balance), making it a significant universal threat all teams should prepare for, and when you account for the limited counters to Magneton in the tier, well.... (also Magnet Rise can fuk with some people, most notably beating Stunfisk 1v1)
Even
if Magneton isn't outright broken, there is no denying it restricts the diversity of the metagame. Most teams need a Magneton response to avoid getting punched open by one of its various sets, and its main hard counters are all susceptible to Grass-types. Of course, pairing a Grass-type alongside Magneton opens up the team to Fire-types, which means responses to Fire-types need to be run, and don't forget you need to be prepared for Magneton as well... Already this seems pretty formulaic, even the likes of Archeops didn't manage to limit diversity to this extent (you can pair Ground-types
or Fighting-types alongside Archeops). Of course, the alternative to defending against Magneton would be to pack a Ground-type + a mon that resists Magneton's remaining attacks (which isn't even foolproof since Magneton is not guaranteed to be Choiced), but when the solution against a threat in the tier is to either check it with two mons or pack one out of a limited number of reliable responses which all happen to be susceptible to a singular type, this makes teambuilding for the defending player rather tricky, and on the other hand remarkably streamlines teambuilding for the Magneton user. This is not a good indication of meta stability / diversity and is a prime example of overcentralisation, and Magneton needs to leave the tier as soon as possible for the benefit of the meta.