The argument about metagame impacts are funny, because you don't even need to reply: "We can just ban the Ghosts later!"
Guess what, in Gen 8 OU, you didn't run a fucking Dark-Type on every goddamn team. Weavile was common as a Pokemon that could take (two) Shadow Balls and get offensive pressure, but that isn't really the same thing as Kingambit which is a dedicated offensive Pokemon that can take both Dragapult/Gholdengo STABS. In SPL XIII, Weavile was third in usage in several weeks, but the next Dark-Type was around 20th place on average, Tyranitar, which also has the SpDef boost for Draco Meteor.
Looking at later stats (October 2022 1695+ Ladder), Weavile has an 18.56% usage, and the next Dark-Type is Tyranitar at 9.87% of teams.
This is because you could already normally fit several Pokemon on a team that naturally checked Dragapult with not much issue, save for SpDef drops. Not even just Clefable or whatever, Pokemon we have right now. This also isn't "oh use a Blissey", that was at 28th usage with 6% usage. Dragapult has a base 100 Special Attack and even with a Specs boost, its power is mostly in its speed. If it was even 350 Speed, it would be mediocre. It's an offensive Pokemon that mostly helps bulkier teams check offense as they scramble to find answers to not lose a Pokemon to it, while Bulky teams can often pivot around it at least a few times a game, without really sacrificing more optimal solutions. Of course, offensive teams use Dragapult too, it's a great Pokemon, but I've heard claims that Dragapult / Gholdengo bother bulkier teams as much if not more than Kingambit, and that's a funny idea.
Let's look at how we checked Dragapult before.
SpDef Lando-T was a good pivot for a few Shadow Balls, but it was also run as a pivot that checked Tapu Koko, so you were probably going to run SpDef anyways. Heatran has had SpDef investment for a few gens, long before Dragapult existed.
SpDef Corviknight has never been bad and is a good check to Tapu Lele before it decides to run Thunderbolt or some shit, which you live one at least, and it checks other Fairies. This would especially be good now because only Choice Specs Enamorus 2HKOs with Mystical Fire, and it can check most Iron Valiant sets.
Weavile can take a Shadow Ball and click SD knowing it lives one more from Specs, and get a lot of progress. It gets blown back by Draco Meteor, but that's easier to check, this was great on offensive teams and bulky offensive teams alike.
Clefable is not in Gen 9, though it will be, but a SpDef set was used in most metas (but not most later ones in Crown Tundra IIRC) that could take Shadow Ball and recover on it, and it wasn't even weak to hazards or status, making this fairly consistent.
Tapu Fini is not in Gen 9 so this is less relevant, but even with little investment you can take two Shadow Balls and switch in.
So basically, Dragapult is a Pokemon that gets a lot of progress but can be walled at least a few times throughout the game, and even give the opponent an opportunity to make progress back. It's a great offensive Pokemon, but it doesn't spam Shadow Ball Turn 1-5 and just instantly get to its endgame, in this meta or in SWSH. The opponent has time to make sure that they do not lose to Dragapult with many tools, and that is increased by Dragapult's low bulk, any single super-effective hit kills it pretty much.
Now, back to Gen 9. We have been given ungodly Defensive Pokemon that are already able to be run that check Dragapult and Gholdengo.
-For one, the Amoongus set that is already run can take Shadow Balls fairly easily and even a Draco Meteor, as well as Gholdengo Make It Rain and Regenerator off to live another day.
-Heatran as a SpDef Pokemon is already a good set that checks these two fairly well and can be given support by other members to lighten the load/increase longevity.
-We are seeing Assault Vest sets on Hoopa-Unbound whose biggest threat is U-Turn,
-the already good Moltres SpDef set takes at best this from Draco Meteor
252 SpA Choice Specs Dragapult Draco Meteor vs. 248 HP / 248+ SpD Moltres: 213-252 (55.6 - 65.7%) -- guaranteed 2HKO
-Samurott-Hisui is a Shadow Ball switch-in already on HO that can feasibly run Assault Vest that just is sacked Turn 2 by a lot of players, you can just wake up tomorrow and choose not to do that, which isn't even necessarily sub-optimal, and be a good answer at least once to especially Gholdengo, but also Dragapult. Draco Meteor does a million, but it takes Shadow Balls well and already can get free Spikes back.
-Ting-Lu is already incredible and only doesn't like repeated Draco Meteors without Rest, or with Spikes up, even with no SpDef investment, at all. Still, almost certainly should bring some, unless you want to lose a lot of momentum.
-Toxapex is rare but also a thing, and its standard Recover set is also a thing, you can use it and it will do the job of checking these two Pokemon.
-Clodsire
Must I say more
If anything, Gen 9 has more ways to stop Dragapult than Gen 8 already, and Gholdengo is mostly checked alongside Dragapult too. And it didn't even take several moveslots, making sure most of your team is faster than one Pokemon, packing three plus Pokemon to hard check them;
Of course, there is Tera. But guess what, that's basically every Tera abuser in the tier, including Kingambit. And even a Tera Ghost Choice Specs Dragapult is not denting things like Ting-Lu. I mean shit, lets give it +2 Modest on top of Specs just for fun
+2 252+ SpA Choice Specs Tera Ghost Dragapult Shadow Ball vs. 252 HP / 0+ SpD Vessel of Ruin Ting-Lu: 197-232 (38.3 - 45.1%) -- guaranteed 3HKO after Leftovers recovery
You do more to check Kingambit on the average team. Gholdengo follows suit almost naturally with most sets, except just making sure you don't lose to Nasty Plot, which also unlike Dragapult is not that fast. We've also dealt with this set before when it was Nasty Plot Covert Cloak being spammed from the First Coming of Garganacl on the ladder and in tournament.
Scarf Trick could be a problem but it's more than feasible to deal with.
What I'm saying is, are you really not able to deal with Dragapult in a post-Kingambit metagame? Really? You can, you just don't want to, and that's silly.
Guess what, in Gen 8 OU, you didn't run a fucking Dark-Type on every goddamn team. Weavile was common as a Pokemon that could take (two) Shadow Balls and get offensive pressure, but that isn't really the same thing as Kingambit which is a dedicated offensive Pokemon that can take both Dragapult/Gholdengo STABS. In SPL XIII, Weavile was third in usage in several weeks, but the next Dark-Type was around 20th place on average, Tyranitar, which also has the SpDef boost for Draco Meteor.
Looking at later stats (October 2022 1695+ Ladder), Weavile has an 18.56% usage, and the next Dark-Type is Tyranitar at 9.87% of teams.
This is because you could already normally fit several Pokemon on a team that naturally checked Dragapult with not much issue, save for SpDef drops. Not even just Clefable or whatever, Pokemon we have right now. This also isn't "oh use a Blissey", that was at 28th usage with 6% usage. Dragapult has a base 100 Special Attack and even with a Specs boost, its power is mostly in its speed. If it was even 350 Speed, it would be mediocre. It's an offensive Pokemon that mostly helps bulkier teams check offense as they scramble to find answers to not lose a Pokemon to it, while Bulky teams can often pivot around it at least a few times a game, without really sacrificing more optimal solutions. Of course, offensive teams use Dragapult too, it's a great Pokemon, but I've heard claims that Dragapult / Gholdengo bother bulkier teams as much if not more than Kingambit, and that's a funny idea.
Let's look at how we checked Dragapult before.
SpDef Lando-T was a good pivot for a few Shadow Balls, but it was also run as a pivot that checked Tapu Koko, so you were probably going to run SpDef anyways. Heatran has had SpDef investment for a few gens, long before Dragapult existed.
SpDef Corviknight has never been bad and is a good check to Tapu Lele before it decides to run Thunderbolt or some shit, which you live one at least, and it checks other Fairies. This would especially be good now because only Choice Specs Enamorus 2HKOs with Mystical Fire, and it can check most Iron Valiant sets.
Weavile can take a Shadow Ball and click SD knowing it lives one more from Specs, and get a lot of progress. It gets blown back by Draco Meteor, but that's easier to check, this was great on offensive teams and bulky offensive teams alike.
Clefable is not in Gen 9, though it will be, but a SpDef set was used in most metas (but not most later ones in Crown Tundra IIRC) that could take Shadow Ball and recover on it, and it wasn't even weak to hazards or status, making this fairly consistent.
Tapu Fini is not in Gen 9 so this is less relevant, but even with little investment you can take two Shadow Balls and switch in.
So basically, Dragapult is a Pokemon that gets a lot of progress but can be walled at least a few times throughout the game, and even give the opponent an opportunity to make progress back. It's a great offensive Pokemon, but it doesn't spam Shadow Ball Turn 1-5 and just instantly get to its endgame, in this meta or in SWSH. The opponent has time to make sure that they do not lose to Dragapult with many tools, and that is increased by Dragapult's low bulk, any single super-effective hit kills it pretty much.
Now, back to Gen 9. We have been given ungodly Defensive Pokemon that are already able to be run that check Dragapult and Gholdengo.
-For one, the Amoongus set that is already run can take Shadow Balls fairly easily and even a Draco Meteor, as well as Gholdengo Make It Rain and Regenerator off to live another day.
-Heatran as a SpDef Pokemon is already a good set that checks these two fairly well and can be given support by other members to lighten the load/increase longevity.
-We are seeing Assault Vest sets on Hoopa-Unbound whose biggest threat is U-Turn,
-the already good Moltres SpDef set takes at best this from Draco Meteor
252 SpA Choice Specs Dragapult Draco Meteor vs. 248 HP / 248+ SpD Moltres: 213-252 (55.6 - 65.7%) -- guaranteed 2HKO
-Samurott-Hisui is a Shadow Ball switch-in already on HO that can feasibly run Assault Vest that just is sacked Turn 2 by a lot of players, you can just wake up tomorrow and choose not to do that, which isn't even necessarily sub-optimal, and be a good answer at least once to especially Gholdengo, but also Dragapult. Draco Meteor does a million, but it takes Shadow Balls well and already can get free Spikes back.
-Ting-Lu is already incredible and only doesn't like repeated Draco Meteors without Rest, or with Spikes up, even with no SpDef investment, at all. Still, almost certainly should bring some, unless you want to lose a lot of momentum.
-Toxapex is rare but also a thing, and its standard Recover set is also a thing, you can use it and it will do the job of checking these two Pokemon.
-Clodsire
Must I say more
If anything, Gen 9 has more ways to stop Dragapult than Gen 8 already, and Gholdengo is mostly checked alongside Dragapult too. And it didn't even take several moveslots, making sure most of your team is faster than one Pokemon, packing three plus Pokemon to hard check them;
Of course, there is Tera. But guess what, that's basically every Tera abuser in the tier, including Kingambit. And even a Tera Ghost Choice Specs Dragapult is not denting things like Ting-Lu. I mean shit, lets give it +2 Modest on top of Specs just for fun
+2 252+ SpA Choice Specs Tera Ghost Dragapult Shadow Ball vs. 252 HP / 0+ SpD Vessel of Ruin Ting-Lu: 197-232 (38.3 - 45.1%) -- guaranteed 3HKO after Leftovers recovery
You do more to check Kingambit on the average team. Gholdengo follows suit almost naturally with most sets, except just making sure you don't lose to Nasty Plot, which also unlike Dragapult is not that fast. We've also dealt with this set before when it was Nasty Plot Covert Cloak being spammed from the First Coming of Garganacl on the ladder and in tournament.
Scarf Trick could be a problem but it's more than feasible to deal with.
What I'm saying is, are you really not able to deal with Dragapult in a post-Kingambit metagame? Really? You can, you just don't want to, and that's silly.