Alright, let me try to help. So you’re going for HO I see. I also see you’ve refrained from legendaries, but this is Ubers.
Ogerpon-Hearthflame:
This Pokémon is outclassed in Ubers. This thing is walled by common defensive Uber Pokémon like Unaware Skeledirge and Haze Toxapex. A better choice is to bring a top-tier Mon that gives Flutter Mane some insane speed:
Koraidon @ Choice Band
Ability: Orichalcum Pulse
Tera Type: Fire
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Low Kick
- Dragon Claw
- U-turn
- Flare Blitz
Banded Koraidon provides some serious firepower that’s hard to switch into. Low Kick and Dragon Claw are STAB. U-Turn allows you to safely bring in Flutter Mane on a predicted opponent’s swap to Skeledirge or Toxapex. Banded Tera-Fire Flare Blitz in sun nukes everything and can 2HKO both Skeledirge and Toxapex, meaning about nothing is safely swapping in.
Flutter Mane:
Under Sun, Flutter Mane has nearly unrivaled speed. The only things I would change is Thunderbolt into Mystical Fire for coverage against Zacian-C and Power Gem to Psyshock to hit Clodsire, although you could keep Thunderbolt over Psyshock and Power Gem for coverage against Kyogre.
Dragonite:
If you’re going to use Extreme Speed use it on the Arceus or the better Dragon / Flying type in the room. Since I have different plans with Arceus, let’s use the better Dragon / Flying type in the room.
Rayquaza @ Heavy-Duty Boots
Ability: Air Lock
Tera Type: Flying
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Dragon Dance
- Dragon Ascent
- Earthquake
- Extreme Speed
Now if you’re worried about Rayquaza’s Air Lock here, Air Lock suppresses weather. It doesn’t remove it. If you need to swap Rayquaza out the weather will be back. Air Lock is actually really useful to suppress Kyogre’s Rain and if Kyogre is locked into Origin Pulse / Water Sprout, Rayquaza can temporarily check a rampage. Rayquaza is great for late game sweeping with Dragon Dance hence the Boots because Stealth Rocks aren’t fun. Dragon Ascent is a powerful move that’s easy to spam, especially with Tera Flying. Extreme Speed allows you to revenge-kill and sweep faster threats Earthquake provides coverage against Miraidon.
Ursaluna-Bloodmoon:
Ursaluna is another case of a Pokémon that’s just not good in Ubers and is outclassed. But fear not, a Miraidon check with Calm Mind sweeping is quite available, and it’s one of the best in Ubers:
Arceus-Ground @ Earth Plate
Ability: Multitype
Tera Type: Fairy
EVs: 248 HP / 144 Def / 100 SpA / 16 Spe
Bold Nature
IVs: 0 Atk
- Calm Mind
- Judgment
- Ice Beam
- Recover
Arceus-Ground can reliably swap into Speced Miraidon using Electro Drift and get a free Calm Mind in return. It can also absorb a Behemoth Blade from Zacian-C and immediately threaten it back using Judgement. Judgement is STAB. Ice Beam provides coverage against Giratina-O that would otherwise Wall it. Recover gives Arceus more longevity and allows more opportunities to setup. Tera Fairy allows Arceus-Ground to be immune to the vast amounts of Dragon attacks in Ubers and better check Koraidon.
Urshifu-Rapid-Strike:
Urshifu doesn’t really fit with a team running Sun( and it’s not too good anyway). I got a couple options to replace it:
Choice One:
Ribombee @ Focus Sash
Ability: Sweet Veil
Tera Type: Fairy
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Sticky Web
- Stun Spore
- Quiver Dance
- Moonblast
Ribombee brings some exceptional speed control for your team, with hazard removal being a bit uncommon outside Corviknight or Glimmora. Ribombee is supposed to be a lead that Stun Spores the first turn, and then sets up Sticky Web the second. Quiver Dance / Moonblast allows you to break potential Sub-setters.
Choice two:
Zacian-Crowned @ Rusted Sword
Ability: Intrepid Sword
Tera Type: Fire / Ground
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Swords Dance
- Behemoth Blade
- Play Rough
- Substitute / Tera Blast
The essence of offensive power, there is Zacian-C. Intrepid Sword with Swords Dance brings insane offensive power. Behemoth Blade and Play Rough are STAB. Substitute stops Ribombee leads, while Tera Blast brings coverage. Tera Fire keeps you from being burned. Tera Ground with Tera Blast gives coverage against Toxapex, Skeledirge, and Clodsire, all who would otherwise wall Zacian-C.
Iron Bundle:
Bundle isn’t that bad, except you are playing in sun. You could still live with it, although I’d suggest Heavy-Duty Boots because of hazards. Why not throw in another Sun abuser though.
Walking Wake @ Choice Scarf
Ability: Protosynthesis
Tera Type: Steel
EVs: 8 HP / 240 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Hydro Steam
- Draco Meteor
- Flamethrower
- Flip Turn
Speedy guy. With more power and also pivot potential. The EVs make sure Speed will activate in Sun. Nothing is outspeeding this in Sun. You could make it more offensive with Spec and 252 SPAtk and Modest nature, although Flutter Mane does that job. Hydro Steam is Water STAB that is more powerful in Sun. Draco Meteor is a nuke. Flamethrower is coverage. Flip turn to pivot. Tera Steel gives some Fairy defense your team needs.
Well, that’s it. Hope this helped!