With regards to this post, quite a few of the mons you have listed as being decent into sun are only capable of making good progress vs some variants of sun. Conversely, sun is capable of making consistent progress against most teams. Exca struggles vs bulkier sun teams with mandi and pert, latios is good but doesn't love dealing with exca and mandi. Scizor helps to rk but struggles to find switches (plus can get walled). Scarf garde isn't great at making progress vs many sun teams, and non scarf garde struggles vs venu. Even if you use many of the mons on this list it is still very likely that you lose.
For excadrill: Yes, there are checks to exca on sun such as mandi and pert, but they are not airtight in the slightest, swampert is very easily chipped by eq (3HKO's) while mandibuzz is 2HKO'd by +2 rock slide if its physdefense (and ofc rock slide flinches exist). And from what I've seen, mandi prefers to be spdef on sun to better answer latios, which is then unable to actually answer exca.
For Latios: Specs draco meteor does so much damage to both of these mons, for exca it can only answer once really, while mandibuzz is forced to click roost to check it, which may potentially burn sun turns and allow a pokemon that can abuse mandi to get in.
For scizor: The teams scizor finds itself on are more volt turny in nature, getting it in should not be a problem considering you are using stuff like fez, sandy shocks, wahstom etc for it. And while it 'can' get walled, typically said mons that can wall it don't like taking its coverage if it ever clicks it (see heatran getting blown up by CC or swampert taking knock/u-turn and getting heavily chipped).
For gardevoir: Unless the opposing team has a heatran (which one focus blast to it takes it out of commision), then scarf moonblast is going to clean. The usual fire resists are either: Scovillain (which takes 40% min from moonblast), venu (who hates psynoise and typically you are getting garde in on venu after a revenge kill or a pivot), ninetales (don't think I have to explain why sacking ninetales hp isn't great) and harcanine (chipped by rocks and doesn't like taking tera fairy moonblast at all). Is it a flawless mon into sun? No. But it can still help a lot into the sun mu lategame by clicking tera and just cleaning up. Also gardevoir is going to be scarf on 80% of teams because scarf moonblast is a great revenge killer/cleaner. Other sets are secondary to that and are much more fringe.
Several of the mons on this list are only able answer 1 or 2 threats on sun. I know the criterion was having a decent mu into sun but that's just not enough. You need to have a good matchup vs sun if you want to be able to beat it with some consistency
Well yeah? A pokemon can be valuable into sun while only answering 1-2 threats. So what if keldeo only answers harcanine? That doesn't mean it isn't incredibly helpful in the MU by checking it and then forcing it out while getting momentum for its team. So what if Clodsire only answers Venu? I can get up hazards and wall a big sun threat. That is how it works just for natural teambuilding, nobody is going to say sinistcha is bad into a normal team if it only answers 1-2 threats even if there is something like an overcoat mandibuzz on the team, those threats can still be big and just doing that makes it useful.
Even if you do, you may still end up being overwhelmed by band harc due to sun's absurd ability to position despite being such an aggressive playstyle.
Yes it can 'technically' overwhelm everything, but that comes not only at the cost of it not only being a lot slower and thus easier to revenge kill, but also the fact that it is rocks weak. If you are not punishing harcanine every time it comes in with either rocks or by using your faster mon to revenge kill it/make big progress then you are going to lose, but teams will naturally be able to do those things. (and if your team doesn't have any mons faster then banded harc, I think there are bigger issues at hand). Weather in any tier has pokemon that can basically overwhelm stuff via sheer power if it gets enough ins. Something like specs walking wake in OU is going to be ripping apart teams no matter the resist, as even those can be 2HKO'd. This is something incredibly similar to banded harcanine, you need to punish the ko's it gets with your own.
The fact that you built that team without thinking of sun doesn't mean that sun is not a big threat in the builder imo. It's already quite a commitment to slot good sun checks on your team, and even doing so you may still lose due to the variance and sheer power of the archetype.
But it isn't a commitment... You don't need to go out of your way to do so.
Heres another team that I made that I didn't really consider sun for.
And another that I didn't really consider (its AV conk and scarf latios).
I could post a bunch of teams that ultimately have very good sun MU's, but I think the point still stands, you do not need to commit to sun checks, those are natural. If you are having to go out of your way to slot good sun checks, IMO that team had bigger issues to deal with. If your team didn't have a slither wing check, you are most likely going to struggle into a gapdos or BU slither. Sun is not a big threat in the builder because you just, fit them automatically? Like I cannot really explain it further, it is genuinelly that simple.
And as for the varience part, it really is overstated how much actual varience the playstyle has. Sun IMO, basically requires:
Ninetales
Slither Wing
Harcanine/Heatran (basically a pokemon that can easily switch into fire type attacks under sun)
Venusaur
These four are absolutely required on a team, and IDT you can do them otherwise. The closest is like, venusaur out for hilligant which is a lot worse into stuff like skarmory, skeledirge, talonflame etc which is not worthwhile IMO. Then you require a defensive pokemon like excadrill or mandibuzz to not just become a trade match that you will most likely lose (considering the team cannot deal with stealth rocks/set them up effectively for instance). This leaves one final slot to pick a mon, which like, you have latios, scovillain, hydreigon and maybe entei? And certain ones have overlapping checks to ones that already check other pokemon. An air balloon heatran answers both venu and scovillain. A tyranitar can check venu+hydreigon. Spdef mandi can check venu+latios.
So not only does the sun team basically have 4 slots that are guarenteed, but also can really only max fit one flex abuser and said abusers are only a few extra mons (stuff like sandy shocks I consider more utility, so maybe 5 mons max extra).
In general, Sun is a powerful matchup fish as it's able to win super easily vs many teams and has very very few unwinnable matchups.
For this last part in the sentence, I would say thats actually a good thing! If sun has no 'unwinnable' mu's, that means there is outplay potential by the sun player, making it less cheesy as a whole. Compare this to something like eterrain, which genuinelly has mu's where they cannot win, and I think that makes for more dynamic gameplay. (add in the obligatory its unable to win super easily vs many teams but I made that point above in this post).
It also limits the opposing player's agency, which further limits skill expression.
Yeah thats kinda how HO works? Like, hazards HO (which IDT people see as broken at all) also limits the opposing players agency, so that point I think is frankly mute.
I am not against action against other threats but sun is very uncompetitive imo. Futhermore, ninetales being banned would bring little to no harm to the tier except lowering variety (which the tier has too much of). The same cannot be said for a keldeo or a latios ban. If anyone believes the tier is too hard to build for due to the large number of threats, then please, a ninetales ban would help to solve that problem. The impact won't be monumental but it would be a step in the right direction. If you (addressing the playerbase at large) do not think sun is broken, you should still consider banning it to lower the number of threats in the tier. This would even be in line with tiering policy! The suspect is already underway, we lose no time by banning tales. We can choose to ignore the major problems with the tier or we can take small steps to solve them at no cost. It's incredibly difficult to account for the various threats such as latios, weavile, lokix etc in addition to sun while also having a functioning team. This has to change, and I believe it can.
I am going to adress other parts of this statement later, but I think the mindset of "well we lose nothing from banning ninetales, so just ban it to lower the amount of threats" is an incredibly dangerous mindset for tiering. This can be utilised to justify banning lots of things from the tier that are ultimately low impact bans just because it reduces amount of threats. By this logic, something like a politoed ban could be justified (and rain has also won a few tour games so it ain't even that bad). Obviously sun is better then rain, but I think you get my point. Banning things that are not broken, uncompetitive or unhealthy just because its low impact is not something that should be done.
The same cannot be said for a keldeo or a latios ban.
While this is true, they also have a much larger impact on reducing builder constraint. That is the point of people suggesting something like a latios ban, it makes the builder a lot more freeing as a result, and ultimately actually addresses the issues people have with the tier.
This would even be in line with tiering policy!
- This can also be a state of the metagame. If the metagame has too much diversity wherein team building ability is greatly hampered and battling skill is drastically reduced, we may seek to reduce the number of good-to-great threats. This can also work in reverse; if the metagame is too centralized around a particular set of Pokemon, none of which are broken on their own, we may seek to add Pokemon to increase diversity.
This is the only part in tiering policy that I found that mentions lowering number of threats. And well:
1. Its under unhealthy, which is stated multiple times as a last resort reasoning, which IDT this metagame is so horrible that this is justified. 6.84/6.58 on enjoyment and 7.08/6.62 for competitiveness, which I think are okay scores and thus drastic action is required. Also further on, it states that" a conviction that the move will noticeably result in the better player winning over the lesser player." which even you yourself have stated does not happen with a ninetales ban.
2. Sun currently sits at B- on the VR, and considering that Ttar and Heatran dropped, which both are incredible into sun, IDT its going to increase in ranking even though the VR is outdated. This is very much something that does straddle even 'good', and I would call it mediocre even.
Ultimately, again, sun you not only don't really have to go out of your way to beat, but also the reasonings for banning it don't line up with tiering policy.