As of the start of the next week in the tour,
Shadow Tag is banned. Gothitelle and its siblings can easily trap a plethora of passive Pokemon in the metagame. Depending on the set, it can PP stall, Trick Scarf, simply revenge kill, or set up and sweep (with me mostly running a setup sweeper set). To talk about my personal experiences, it is relatively common to be able to set up on a passive Pokemon to then win at +6 SpA / +6 SpD. To highlight this set, and celebrate one of my best teams, I also wanted to share this team (which maybe you can edit to still worked but Gothitelle was an important piece:
https://pokepast.es/efc77f5642961e66

Gothitelle @ Leftovers
Ability: Shadow Tag
Tera Type: Electric
EVs: 252 HP / 4 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Calm Mind
- Substitute
- Stored Power
- Thunderbolt
Gothitelle was the centerpiece and does one important task: punish bulkier / stall teams. It is a relatively straightforward Pokemon that aims to get into battle safely (read: without getting statused or knocked off), get a Substitute on a Pokemon that cannot break the Sub and start setting up. Bonus points if the opposing Pokemon is special that, at some point, cannot 2 or 3-hit the Sub. Against most teams, if it successfully sets up, the battle is over. At +6/+6 it is extremely difficult to check, even with Unaware, and it can usually kill the trapped Pokemon with its Sub up, which forces even offensive teams to sacrifice another Pokemon before killing it.
The downside of this set was that, due to Stored Power, it was relatively weak if there was not a Pokemon that it could trap safely, as it required setup. Unboosted Thunderbolt is also not very powerful, but usually the rest of the team managed to dismantle more offensive teams.

Persian-Alola @ Leftovers
Ability: Fur Coat
Tera Type: Fairy
EVs: 248 HP / 8 Atk / 252 Spe
Jolly Nature
- Parting Shot
- Knock Off
- Thunder Wave
- Roar
Underrated Pokemon! Works very nicely as a pivot, even with limited survivability. It can check nearly any physical Pokemon once; Roar is nice against Pokemon that try to set up against you and synergizes nicely with the hazards on Clefairy / Skarmory. Parting Shot helps Gothitelle trap weakened Pokemon and is a great move to pivot (and to make Espeon switch out, if needed) while Knock Off is always valuable.

Clefairy @ Flame Orb
Ability: Magic Guard
Tera Type: Steel
EVs: 252 HP / 4 SpA / 252 SpD
Calm Nature
IVs: 0 Atk
- Stealth Rock
- Moonlight
- Moonblast
- Trick
This Clefairy set is a lot of fun and extremely specially bulky! I think a mixed defensive set might be better, but then again, this team has Persian-Alola to be a temporary hard-stop against physical threats. In addition, physical Pokemon cannot switch in safely while you have your Flame Orb available to burn them: suddenly they barely dent you. I really love this tech, as it patches out a big weakness for Clefairy and crippling Pokemon gives Gothitelle / Koraidon / Salazzle set-up opportunities and also helps stall out Pokemon if needed.

Koraidon @ Loaded Dice
Ability: Orichalcum Pulse
Tera Type: Fire
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Swords Dance
- Scale Shot
- Close Combat
- Flare Blitz
Simple Koraidon set that functions as a very strong wincon. You try to find a point to Swords Dance up safely (notably against opposing Araquanid) and proceed to boost your speed with Scale Shot. At that point, it is extremely hard to stop! Its main weakness is that its nature is very much that you get one attempt to sweep, due to its weakness to hazards and chip in general (with Flare Blitz chipping Koraidon itself..).

Skarmory @ Leftovers
Ability: Sturdy
Tera Type: Fighting
EVs: 252 Def / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Taunt
- Spikes
- Whirlwind
- Body Press
This is my offensive lead set! I think on this team, Roost might be valuable as this team also has a defensive mode between Clefairy / Skarm / Persian-Alola, but at the same time, that core is never meant to survive for too long (at least, Persian-Alola isn't) and against some threats, Leftovers can already be enough to be extremely annoying. Sometimes, the chip healing can sustain Skarmory for annoyingly long periods. However, I really like running Taunt on teams without hazard removal, so opposing Pokemon cannot get hazards for free on Skarmory. Spikes seems self-explanatory, and Whirlwind avoids Skarmory from being setup bait. Finally, Body Press is a nice check in case Skarmory needs to do some damage. Very nice lead, too!

Salazzle @ Heavy-Duty Boots
Ability: Corrosion
Tera Type: Ground
EVs: 252 Atk / 4 SpA / 252 Spe
Jolly Nature
- Dragon Dance
- Fire Lash
- Gunk Shot
- Tera Blast
The final Pokemon is Salazzle, and its a surprisingly good Dragon Dance user! Salazzle really annoys bulkier teams, even without Toxic, as its Fire Lash is hard to switch in to, especially when it might be followed up by a Gunk Shot at -1 Defense. Meanwhile, at +1 it outspeeds the metagame, allowing it to put in work against offensive team and weaken Pokemon for Koraidon (or vice versa). Notably, its typing allows it to switch in against many Fighting, Fire, and Fairy-types (such as some Breloom sets) and set up, which also allows it to fit into the main gamemode of this team: try to find an opening to win, while being able to play the defensive game for a little while.
Overall, this team felt like one of my most consistent ones. I might try to make it work without Gothitelle, but it'll be hard to patch the hole it will leave (despite wallbreakers in Salazzle and Koraidon). Against many teams, it just... 6-0d when it came in. However, I'd recommend giving any Pokemon on the team a try, you won't be disappointed!