USUM OU is my first metagame on PS and Smogon (but I joined in the SS era...) and even though I've mostly moved on from it, I still play it quite a bit. I've been returning to it during the last few weeks and I still like it as much as ever. I don't see myself stop playing it completely in the future at all (even though I expect hiatuses) and it will always have a special place in my heart.
Anyway I'm stuck with an hour-long history video so I'll just answer some of these questions
What are your personal favorite Pokemon to use in the metagame, and why?

This should be no surprise to those who know me (aka no one) but I love Volca. It's why I decided to start out in USUM in the first place despite SS being the current generation (I didn't know Natdex existed back then). Anyway, Volcarona always have been known to be the "matchup moth" that hopes to win on team preview as opposed to in the game, but I think that it has a lot more than that back in SM. Volca can pick its counters - yes, every last one - by choosing which moves it runs. Problem is, you still can't cover everything at once - for example, if you run Buginium Z, then Toxapex beats you, but if you run Psychium Z, then Tyranitar beats you. Despite that, Volcarona is still one of my favorite Pokemon use in USUM OU, if only because I'm personally super biased towards it. Quiver Dance is an amazing move and everyone knows it, and Bug/Fire is honestly amazing both conceptually and competatively. Besides, you still have 5 other Pokemon to take care of anything Volcarona can't kill.

When I was starting out Bulu was my least favorite of the Tapus. Grass type was the least appealing to me, its the slowest of the four, and it hates a whole bunch of Pokemon that I likes back then (like Skarmory and Volcarona). And then I used it. MAN does this thing hits like a monster truck. Banded Bulu is nearly impossible to switch into if it packs the right moves (though I run into Tangrowth and Mega Venusaur a lot more often than I'd like to), SD Bulu just kills stuff after a boost, and Kartana is even more scary under Grassy Terrain. You think Lele's Specs Psychic is powerful? Try switching a 2x resist into a Banded Wood Hammer. I remember this time when Tornadus-T thought that it can come in for a free defog then got promptly OHKOed after rocks. Banded Bulu is my favorite Bulu by far, and it
is a bit prediction reliant, but nailing that smug Ferrothorn with a Superpower is totally worth it when I get it right. Currently I'm polishing a Grass spam team featuring Bulu and Kartana, and I gotta say, if you get your predictions right you can kill basically anything with these two.

because it fuels my sadistic desires of watching pokemon lose their hp just by switching in
When I saw this thing and its incredible mixed offenses, I asked myself, "how is this thing legal?". Then I saw its crazy base 132 speed tier and STAB Hydro Pump, and I asked myself again, "why is this thing not banned to hell already?". This opinion eventually changed, but Choice Specs Ashgren is undeniably one of the strongest wallbreakers and sweepers in the meta by far. And nuking stuff with Specs Hydropump is always fun. But what I like the most about this is the amount of roles that it compresses offensively, allowing me to use more specialized offensive Pokemon or Pokemon that would otherwise be hard to fit into some teams. Once transformed, this thing can wallbreak, clean, set hazards (or pivot if you choose to run U-turn), revenge kill, etc etc etc. It's basically your perfect offensive Pokemon. Now, Greninja often cannot break through certain defensive Pokemon even after transformation, but it has something to more than make up for it: Spikes. So as you force out things like Heatran you can lay down Spikes instead of futilely throwing out a Hydropump against Toxapex. And this is only compounded by the fact that none of its common answers, barring Tapu Fini (which is relatively easy to wear down), can remove hazards. Not to mention that it can run stuff like Gunk Shot or Ice Beam to beat down its common answers. Another thing is that, even untransformed, Greninja is stronger than it looks, 2HKOing or 3HKOing Pokemon like Rotom-W and non-AV Magearna. And Greninja does a good job of taking advantage of its own Spikes as well, for example 2HKOing Toxapex after 3 Spikes or 1 Spike + SR. The only thing I don't like about it is that Hydro Pump somehow hits less often than Lovely Kiss from my Flame Orb Gengar in BH.

No surprise here. Kartana hits hard and has always been one of the best Pokemon in the USUM metagame. SD Normalium Z sets are effective on low-mid ladder mostly because people don't expect their Zapdos or something getting OHKOed by Kartana, opening their team up for a clean sweep. Scarf sets hits hard and fast and gets stronger after taking a kill, often leaving them with a lose-lose situation - once their walls are weakened and revenge killers are gone, you can't stop this thing from starting up and you can't stop this thing after it gets started (AKA why Naganadel is awesome in USUM Ubers, fight me if you want). And Banded sets are probably what you would expect from something with base 181 Atk, though its low-ish BP moves are a bit disappointing. As I said, I've been working on a Grass Spam team with Scarftana and Banded Bulu, and this thing just cleans house after its counters are gone. Even the madlad Timid Nagatana can be put in some work, because who doesn't like to cheat and beat all of its revenge killers?

Absolutely incredible power with the ability to break through most of its counters - what's not to love? Specs Lele is a nuclear bomb that powers up other nuclear bombs like Mega Medicham and Hoopa-U, and CM Z Lele can run like 10 different Z crystals, from Ghostium Shadow Ball to Electrium Thunder. Honestly though, my favorite Lele is probably Scarf Lele, which surprises and KOs tons of mons like MLop. It effortlessly revenge kills most offensive Pokemon because its powerful even without Specs. Scarf Lele also cleans relatively easily on a chipped team, providing that Psychic resists are gone of course.

Probably the only stupid fat mon on my list, Celesteela is practically allergic to dying even without reliable recovery. Leech Seed + Protect + Lefties just make people tear their hair out, and Heavy Slam hits for 120 BP 999.9% of the time (thanks to the fact that it weighs 999.9 kg). Automotize Celesteela is honestly mad underrated and can clean some teams, though Heavy Slam only hits for 120 BP 499.95% of the time (you will prolly run Flash Cannon tho so whatever). If they make a Steel-type move called "Repair" or something I will literally ragequit and move to hellland aka SS Ubers, only to jump off a cliff because it turns out ZamaC got both this and Body Press.

Saving the best for last (ok 2nd best, no one is topping Volca), Gliscor is the all-around defensive utility belt that I can always rely on. It gets pretty much everything that you could possibly want to have. Basically there are two variants of Gliscor. The first is bulky defensive Gliscor, running EQ, Roost, and then two of SR/Defog/U-turn/Taunt/Toxic/Knock/Protect/Ice Fang (yea this thing's movepool is pretty beastly). Then there is
starkiller stallkiller Gliscor, with Swords Dance (yes it gets that too), Facade, EQ, and Taunt/Roost, complete with PHeal to make stall roll over in their grave. And then there are weird, less common sets like Fling Acrobatics, Sub SD, SubToxic, etc etc etc. Poison Heal is downright amazing for Gliscor and is the big reason why I love to use it so much (and why its used over Lando a lot). Gliscor when played right is a huge pain in the ass to KO, and it can do practically any utility that your team wants.
Honorable Mentions:

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What current cores do you find to be strong or fun to use?


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Standard Grass Spam


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Standard Psyspam

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Nuke stuff with +3 Hydro Vortex and watch them cry as you rest to full then wake up with Hydration.

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Man I just noticed I use a lot of Kartana lol.
Do you like the current metagame, or find it to be well balanced? Why or why not?
The current metagame is awesome lol and pretty well balanced, I can build without always keeping an eye on that one threat, nothing is way too dominant in this metagame. As Red Raven said the offensive threats are really crazy in USUM between Megas and Z-Moves but we have enough defensive resources to keep them in check. He basically said what I want to say but said it better than I ever could. Fitting an Ashgren/Lele answer can be sometimes painful though, and you get surprised and lose to niche sets like madlad Timid Nagatana quite a bit.
EDIT: Went to calc for Ashgren damage outputs and then a small part of my brain told me to click the "Rain" button. Lord Jesus Christ this thing is literally unwallable under rain. And considering that practically all rain teams run both SR and Spikes... well, just look:
252 SpA Choice Specs Greninja-Ash Hydro Pump vs. 248 HP / 8 SpD Eviolite
Chansey in Rain: 289-342 (41.1 - 48.6%) -- guaranteed 2HKO after Stealth Rock and 1 layer of Spikes
252 SpA Choice Specs Greninja-Ash Hydro Pump vs. 252 HP / 252+ SpD
Toxapex in Rain: 128-151 (42.1 - 49.6%) -- guaranteed 2HKO after Stealth Rock, 1 layer of Spikes, and Black Sludge recovery
252 SpA Choice Specs Greninja-Ash Hydro Pump vs. 252 HP / 68 SpD
Venusaur-Mega in Rain: 183-216 (50.2 - 59.3%) -- guaranteed 2HKO
252 SpA Choice Specs Greninja-Ash Hydro Pump vs. 248 HP / 40+ SpD
Tapu Fini in Rain: 160-189 (46.6 - 55.1%) -- 99.6% chance to 2HKO after Stealth Rock and Leftovers recovery
252 SpA Choice Specs Greninja-Ash Hydro Pump vs. 252 HP / 232+ SpD
Ferrothorn in Rain: 150-177 (42.6 - 50.2%) -- 95.3% chance to 2HKO after Stealth Rock, 1 layer of Spikes, and Leftovers recovery
252 SpA Choice Specs Greninja-Ash Hydro Pump vs. 252 HP / 244+ SpD
Assault Vest Tangrowth in Rain: 166-196 (41 - 48.5%) -- guaranteed 2HKO after Stealth Rock and 1 layer of Spikes
252 SpA Choice Specs Greninja-Ash Hydro Pump vs. 248 HP / 252+ SpD
Tapu Bulu in Rain: 169-200 (49.2 - 58.3%) -- 98.4% chance to 2HKO after Stealth Rock, Leftovers recovery, and Grassy Terrain recovery
Mind you, these are literally the hardest checks/counters to Ashgren in the entire tier, minus water immunities and weird AV mons. And considering that rain teams almost always pack Ferrothorn to set hazards, as well as the fact that Greninja itself often runs spikes, these situations are a lot more likely that you'd think.
Off to building a rain team now. Cya!
