imo ape and zama should definitely get the hammer, pult probably should and gambit should absolutely not get sent to ubers
first,

ape's 2 main sets- bulk up and rest- have drastically different answers, and often require slotting some uncommon mons/moves to beat, such as tera fairy garg and the like, the main issue I have with ape is that once it gets going, it's incredibly hard to stop, and it's an unnecessarily harsh check to pivot moves or more passive mons. Ape's ability to take a mon like clodsire and proceed to set up on it make it incredibly hard to stop once it gets going, as every single point of chip damage it takes only makes it harder to wall, it absolutely shreds slower bulkier teams with little to no effort as long as it gets the smallest amount of support, and has very few actual walls
second, current suspect test target,

zamazenta's got 3 sets, all of which have very different counters (where have I heard this before) the fact of the matter is, if you misread any switchin when zama comes out if it's cb, you WILL lose a mon, or maybe even the game, it's insanely fast, has coverage for literally every single relevant mon in the metagame and packing an adaptability close combat boosted by choice band makes it a phenomenal breaker for teams that can afford to slot it. unfortunately, that's only set 1, idpress zama is a very potent setup sweeper, that often only needs 1-2 turns before obliterating a team, it's an excellent use of defensive tera, allowing it to beat mons that would normally beat it, like tapu lele, while it's more uncommon, its main strength is that it thrives on forcing what CB zama does best, switches, switching in on an idpress zama gives it a free turn to setup, making it that much harder to deal with. finally, the z-howl set, which uses a normallium z and howl as a one-time swords dance, this packs all the power of CB with none of the locking, making it incredible hard to switch into. while I feel like any one of these sets being on a single mon is generally fine (idpress garg isn't exactly a top-tier metagame threat) the fact that one mon can run any one of these 3 drastically different sets, each of which has their own checks and answers, of which you won't be able to tell if you predicted right until the zamazenta actually does the thing its set is doing pushes it over the edge imo, it's basically a 1/3 chance to just not lose a mon the first time it comes in each game
third, ssnd problem child,

this one's a bit shorter, but while I feel like pult is definitely a problematic mon and deserves to be banned, I just feel like right now S/V natdex ou has bigger fish to fry and more important mons that should get dealt with first
fourth,

this is by no means a weak mon, its one of the best revenge killers in this format and is fairly convincingly argued for being one of the best pursuit users in the tier, the main reason I don't hve issues with kingambit is while it has some pretty decent set variety (black glasses, lefties, odd CB variants) 95% of the time, its gameplan is always very similar and predictable, which is it'll either set up, click knock off or try and read a switch w/ pursuit. your mons that can check one set of kingambit's can probably check every other one too, so while it's strong, its not overbearing. in fact, I feel like kingambit being in this tier is basically the sole reason why dragapult is less of a problem than it should be, and I've seen that most people complaining about this mon aren't complaining about the mon itself, but rather how well it abuses tera, which is its own can of worms, but while boosting its sucker punches and the like to extreme damage values is a valid complaint, I feel like the issue lies within tera itself, not kingambit.
and now, for a mon I feel like not nearly enough people are talking about right now,

in my opinion, I think cyclizar is a contender for the most problematic pokemon in ou right now, this thing was banned from S/V ou and for a damn good reason. free subsitutes are insanely valuable, and cyclizar is a phenomenal enabler for potent setup sweepers like dragapult, dragonite or ddance mgyara. this issue is only further exacerbated by the existence of koko/grimm screens, often giving sweepers 2-3 free turns, which gives them ample time to then sweep through teams not immediately prepared, and on top of all that, cyclizar has great utility outside of shed tail, being able to rapid spin on hazards, access to a fast taunt or threaten revenge kills on mons like mscizor and heatran, currently the single reason that screens HO is one of, if not the best archetype right now
but hey, I'm just kinda a shitter so take some of what I say with a grain of salt as I feel there are people much more qualified than me to have an opinion on the current metagame state in S/V ndou, these are just my opinions, and I'd be glad to hear yours as well on the matter