since the tour is over, i will give some thoughs about the tier and share some teams (since i won't use them in NDPL)
Sneasel Darkinium BO :
p straightforward build, wanted to pair two v strong breaker, mainly luke and sneasel. Luke seems really busted, and i'm surprised nobody ever tried it so far, even with Cobalion. Main reason i wanted luke over coba is because of the sheer strengh it has compared to cobalion. I also wanted to have a good HO MU.
Celebi is defensive here, as it can check a lot of threats, especially when paired with refresh seismi and crobat. I elected Psychic as my main damaging move, as i want to be able to threaten chesnaught, and hit hard crobat on the switch.
rest is p self explanatory, icicle crash/triple axel can be use on Sneas but Low Kick is just better imo, let it deal easily w Cobalion. Also worth mentionning Z Dark deals with Milotic with a layer of spike (otherwise it's a roll).
Sylveon Specs BO :

this team is based on the sylv specs gross scarf core, as many of gross check are forced out by sylv. I elected scarf here mainly because I needed speed control, but another version would be a Z Move agility gross and scarf misma, even if it's less good imo.
Misma is an interesting pick here, as i noticed most steel set nowadays outside of steelix play body press and protect, which allows misma to abuse that by subbing and spamming NP. Zarude can be a bit difficult, but misma will OHKO scarf variant w dazzling after sr/one layer of spike, and boots can be dealed with Noivern
NP Luke Smash Toise HO :

Just a regular spike offense, I thought of trying physical tortank which might be better considering the coverage I'm using. Imprison klefki is mainly to prevent defog and force the opp to kill klefki, which will end into a situation where opp will have to choose between remove hazards and prevent you to setup/sweep. Toise is lum to setup in front of volcanion.
CM Volt Kou Stack :

I like a lot cm volt raikou, because when people see the volt switch they usually don't expect it to be a cleaner. Rest is a v simple goli structure, even if it's a bit frail against Electric types but well that's the downside of not using a grass type. You might need to pivot a lot between gard/kou/lurk in order to deal with them. Toxic Vern helps against Raikou CM, so that your own Raikou will win the CM War (assuming you don't get crit). The original team had sd volt switch coba, but since i'm sharing stuff i decided to change the set so that it's more standart.
Sub Misma Colbur Lurk Stack :

Team is p self explanatory, you just spam hazard, then one of your two ghost has a huge MU. Colbur help luring in Zarude, as Pwhip isn't really the move you want to click. imprison klefki to prevent defog, and sub misma to abuse steel. Noivern has a bulkier spread as it's your main Volcanion answer. dealing w electric type is a bit easier, but you still need noivern toxic.
Prison Key BD Ches :

Last but not least, a really fun cheesy team. The idea is to trap and remove what prevent chesnaught to setup and sweep, mainly crobat and noivern. Fairy Lock will trap the two pokemon on the field on the next turn, meaning you want to fairy lock crobat and noivern on a u-turn. The right sequence of play in order to pull that out is to lead klefki, fairy lock on the u-turn, and then you trap and kill w deedee for bat and flygon for noivern. Rest is just put together so that i don't get annihilated by the rest of the metagame.
Overall I enjoyed building in that tier, but the 3 ppl final stuff really killed the fun cuz i had to prep a lot in a short amount of time (in a way i'm glad dlanyer beated me so that we don't have a chance to reset loser finals). So now i'm more cold about the tier, even though i still think it's a fun metagame. I always play very offensive stuff, outside of when I want to meme someone, which means those teams might be a bit inconsistent on the long run.
I wanted to s/o
Lupla for helping testing at the beginning of the tour and
Dlanyer for testing/building at the end. Thanks for reading
nb : nicks are french name of the pokemon.