This is a very basic and straightforward Offense structure. Hopefully people not as basic as me can come up with something cooler.
Kommo-o is viable because it matches up favorably into Zygarde / Urshifu-R / Kartana teams. Dragon is a suburb typing at the moment, giving it resistances to all of Fire, Water, Grass, and Electric. I choose the Clangorous Soul set because it seemed a lot more fun to play with in a fast paced metagame.
First things that came to mind were Tapu Fini and PsySpam, which the popular combination of Kartana and Rillaboom matches up well into. While Kommo-o can boost its Speed on its own, Tailwind is everywhere and I wanted to make sure I could match any opposing Speed control. Fake Out also gives Kommo-o space to boost, while in return it can (somewhat) handle Heatran.
Choice Band Zygarde further improves the PsySpam matchup and is overall insanely good right now. It gives me a much more reliable Heatran switch-in and benefits from Kartanas fast Tailwind incredibly well. It also does a fine job chipping Tapu Fini so Kommo-o can later go onto sweep, and it can also function as a late game cleaner if Kommo-o does the breaking first.
Wanted more for Tapu Fini, a Dragapult check, and a way to shut down opposing Speed Control. Zeraora checks all of these boxes, while additionally providing even more Fake Out support.
Last slot needed pressure Kyurem-Black and also Grass-types, so this is one of the times where Zapdos-Galar is better than Urshifu-R. I felt like I had enough Speed -- Kommo-o's boosting, Kartana's Tailwind, Zeraora -- so I chose Choice Band over Choice Scarf to deal massive damage.
Kommo-o @ Throat Spray
Ability: Overcoat
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Clangorous Soul
- Clanging Scales
- Aura Sphere
- Protect
Aura Sphere is chosen at the last move to OHKO both Heatran and Kartana at +2. Not really sure which ability is best, but I went with Overcoat to make Amoonguss set up fodder I suppose.
Kartana @ Scope Lens
Ability: Beast Boost
EVs: 4 HP / 252 Atk / 252 Spe
Jolly Nature
IVs: 0 SpA
- Leaf Blade
- Sacred Sword
- Tailwind
- Protect
Insane Pokemon.
Rillaboom @ Miracle Seed
Ability: Grassy Surge
EVs: 148 HP / 104 Atk / 4 Def / 252 Spe
Adamant Nature
IVs: 0 SpA
- Fake Out
- Grassy Glide
- U-turn
- Superpower
104+ with Miracle Seed OHKOs Urshifu-R. Superpower is chosen on the last move to hit Kartana. 148 / 4 will always live one Choice Band Urshifu-R Close Combat. I think killing Urshifu-R is loads more important than surviving hits from Nihilego at the moment.
Zeraora @ Sitrus Berry
Ability: Volt Absorb
EVs: 4 HP / 252 Atk / 252 Spe
Jolly Nature
IVs: 0 SpA
- Fake Out
- Plasma Fists
- Taunt
- Knock Off
Fast Taunt is really good into Zapdos and Kartana, while Knock Off gives me some resemblance of a Dragapult matchup.
Zygarde @ Choice Band
Ability: Aura Break
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
IVs: 0 SpA
- Thousand Arrows
- Thousand Waves
- Superpower
- Extreme Speed
Partial Trapping is really good, and there's no Cresselia or Porygon2 around that you need to Toxic.
Zapdos-Galar @ Choice Band
Ability: Defiant
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
IVs: 0 SpA
- Brave Bird
- Close Combat
- U-turn
- Steel Wing
Can't see myself clicking the fourth move on this Pokemon ever, but maybe I get to snipe any random Diancie.