I thought I'd throw my name in the ring and post some sets that may or may not be any good. I've only tested the first 2 so far.
Espeon (Greninja) @ Choice Specs
Ability: Magic Bounce
Tera Type: Water
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Spikes
- Switcheroo
- Hydro Pump
- U-turn
72/110/82/135/94/149
Anyone else think his ears look like boomerangs or origami?
This thing is FAST. Espeon gives Greninja magic bounce, allowing Greninja to act as both a lead and an anti-lead. Spikes is usual Greninja stuff, but Switcheroo + any choice item gives him utility and can change how he plays. Specs gives him more offensive presence while allowing him to neuter physical attackers and support pokemon, while scarf lets Greninja outspeed almost everything that isn't at +2 speed while still letting it cripple things. You don't even have to lead with it, making it easier to bounce rocks back due to the opponent not knowing it's fused with Espeon yet.
Glimmora (Kleavor) @ Focus Sash
Ability: Toxic Debris
Tera Type: Bug
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Stone Axe
- Close Combat
- Lunge
- Tailwind
70/148/117/77/90/106
Shake his hand at your own risk.
This set is a dedicated lead. Kleavor gets hazards up very reliably by using Tailwind (unless a stupid Walking Wake decides to land a burn as you Tailwind...) and then Stone Axe. Tailwind lets you move before most things, and paired with the sash the opponent needs specific counterplay or rng through Kleavor missing (or a turn 1 burn...) to stop rocks from going up. Toxic Debris is why I chose Glimmora, so even if you don't get rocks up, Tspikes likely will. If this thing dies before Tailwind goes down, you also get a turn or 2 of tailwind for other threats to abuse which is a nice bonus.
Bombirdier (Lycanroc) @ Life Orb
Ability: Rocky Payload
Tera Type: Rock
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Accelerock
- Stone Edge
- Drill Run
- Swords Dance
75/140/86/70/86/132
Get ready to be rocked and rolled!
Rocky Payload boosts Lycanroc's Accelerock so it can smack things with powerful priority, further boosted with Life Orb and Swords Dance if you can get it up. Stone Edge for more immediate power and Drill run for opposing rocks and steels, unless they have Levitate. You could drop something for Close Combat to hit them, but Levitate Gholdengo doesn't really care either way.
Diancie (Dragonite) @ Leftovers
Ability: Multiscale
Tera Type: Dragon
EVs: 244 HP / 252 Def / 12 SpD
Impish Nature
- Roost
- Thunder Wave
- Outrage
- Iron Head
91/159/132/125/137/92
Here's a friendly reminder that Dragonite learns more than just Extremespeed.
I wanted to build a bulky support Dragonite set after remembering Diancie exists, and this is the result. It boasts amazing defensive stats while still hitting decently hard without investment. You can invest in either defense, depending on what you want/need. Roost and Leftovers for recovery and Multiscale lets him switch in easier and even can take an ice attack. Thunder Wave for RNG and speed control while Outrage or Dragon Claw for damage and Iron Head for fairies and paraflinch shenanigans.
Okidogi (Chansey) (F) @ Eviolite
Ability: Toxic Chain
Tera Type: Normal
EVs: 248 HP / 252 Def / 8 SpD
Bold Nature
- Body Slam
- Seismic Toss
- Soft-Boiled
- Chilling Water
250/37/33/49/126/70
Refusing to die since 1998.
Gen 9 hit Chansey like a +2 Close Combat, so out of pity for the thing, I tried fusing it with Okidogi, who has more defense than the other 2 with Toxic Chain. That and I wanted to see if I could do something with Eviolite following it's unban. With Eviolite it's defenses hit 271 and 435. The HP EV's aren't maxed so it takes slightly less passive damage. Body Slam can paralyze or badly poison. Seismic Toss is Chansey's best direct damage and can badly poison. Chilling Water lowers the opponents attack and can hit ghosts. Oh, and it can badly poison in case you didn't already know. Do I expect this set to be any good? Not really. Do I think it's funny? Kinda.
EDIT: Chansey could probably take Thunder Wave, Heal Bell or Stealth Rock over Body Slam for more/better support.