You did it again. You are disrespecting the opponent's choice.
YOU don't decide that Dragonite switches into Aegislash. YOUR OPPONENT chooses who switches in. Why are you assuming that the opponent has made a suboptimal choice? As I've made clear in this thread
repeatedly, there are tons of very good pokemon that wall common Aegislash sets.
But sure, we can agree to disagree here. I don't think you understand what I'm trying to tell you. And instead of listening to me, you've begun to actively insult me.
EDIT: I'm willing to listen btw. But our discussion so far is clearly counterproductive. You cannot expect me to
prove a negative.
I cannot prove that there is "no useful situation for King's Shield" (outside of pursuit, which I have ceded to you already).
Instead, it is your responsibility to demonstrate a non-pursuit situation where King's Shield is useful. I only ask that you make sure that the opponent makes "respectable" moves. None of this "assume that D-Nite spams Fire Punch, taking a -2 Penalty against King's Shield every turn" crappy opponent assumptions. (Do you seriously expect me to believe a respectable opponent will switch in a physical contact-move user against Aegislash?)
I haven't insulted you at all, just said you ignore certain things to fit your agenda.
And please tell me HOW I'm disrespecting the opponent by saying dragonite switches into Aegislash? It was a good example and I'll explain to you why. In a set that lacks King's Shield, Dragonite can come in and revenge kill with a fire punch, this kills both the 252HP sets in Attacking mode, and obviously
UltiMario's 0 HP set. This means you HAVE to switch, or risk dying to the fire punch, this allows Dragonite to either hit something hard on the switch, or set up with dragon dance. Now, lets say he decided to dragon dance, whatever you switch in probably won't be able to switch in and KO back. Skarmory for example, can come in, but is limited to phasing him out. This is a situation, where without king's shield, Dragonite forces you out, and unless you have something that can effectively stop him, he'll inflict a good amount of damage to your team, however with the kings shield set, it allows you to stay in, and be a prime Dragonite killer, taking the fire punch and KOing in return. Not only that, but now you have a Aegislash still on the field at +2, meaning anything else coming in is likely to take a solid chunk of damage.
There you go, there is your usefulness of kings shield. Now, you may say "but you can have X pokemon to counter dragonite" and while that is true, you won't have a pokemon at +2 left on the field, and you'd have to spend a team slot on that pokemon, when instead of spending a whole teamslot on it, you could just spend a moveslot on it.
By the way, I love how you again, make it out like I said dragonite spammed fire punch, which when you look at what I said, I never said that at all, I said he'd set up with dragon dance, which KS Aegislash can counter, only pointing out fire punch kills non KS sets. Nowhere in that have I relied on KS making dragonite go down -2, but only on switching Aegislash into his defensive form. This is why I say you ignore stuff and make the Aegislash player bad, to fit your agenda, because that is what you've done, and now you've tried to twist my words to make the KS Aegislash set appear to be bad.
The Mixed set dies to Dnites fire punch, a 252hp set can die to dnites fire punch, the KS Aegislash doesn't need KS to make Dnite take -2, but just needs it to switch forms, so that Dnite can't kill it, but it can kill dnite (admittedly, it does need rocks up to break multiscale, but that isn't too difficult to make happen with a ghost type, if rocks aren't up, then it would be better to switch). That is just one example, there are numerous other points where you could KS to be in defensive form and take a hit and KO, where otherwise without KS you'd be forced to switch and lose momentum, especially as the game wears on and damage starts to rack up. KS allows you to switch still, if it's too scary to stay in, but it also allows you to stay in where you couldn't otherwise. The -2 part of KS is a bonus that stops CB sets, not the part that you use it for.
Edit: Some of my calculations on D-nite were incorrect, and have edit to reflect to correct calculations, but as long as multiscale is broken, Aegislash comes out on top, admittedly not as well against a LO set, but comes out on top regardless.
Edit: Another example, choice band Azumarill, if the game has worn on, you've taken a bit of damage and are around half health, Azumarill can come in and KO the 252HP sets from starting from 55.55% health, while killing the 0HP with Aqua jet from 68.96%, the KS set guarantees to put it at -2, meaning he can only do max 30% with
waterfall, basically, without KS, he can revenge kill after a little damage/LO recoil, while with KS, he can not at all, while you could just KO him. Azumarill is probably the only pokemon I'd recommend running speed on, just so you only have to take a Aqua Jet instead of a Waterfall (not that I think an Azumarill would risk it anyway). Removing KS gives him other advantages, but also means some pokemon can effectively hurt him. Now, please don't say "a smart player won't use CB Azumarill against KS Aegislash", because you're right, they won't, but that's point, they would if he didn't run it, they won't because he does.
Another example, CB Scizor, I know you said outside pursuit, but it is worth noting the OU's most overused pokemon laughs at a set without KS, while with KS, he becomes deathly afraid, since he can't KO, and is KO's 50% of the time, or 100% after rocks.