Hello, this team took me to top 500 ladder (not really a big achievement, but I believe it's a good team nonetheless):
https://pokepast.es/73bfb95cb155bc5b
Most of the teams I make end up being bad, but this one stuck out of the bunch and ended up being solid. It revolves around the 4 defensive pokemon in it: Rotom-H, Sylveon, Seismitoad and Corviknight.
Rotom-H is there to easily take hits from Scarf G-Darmanitan and and take 3 hits from Banded G-Darm, it also serves as a check to things like Corviknight, Ferrothorn and Physical Aegislash.
With rotom, you'll want to be throwing wil'o'wisps around all the time, to catch and cripple the recovery of pokemon like Seismitoad, Toxapex and Hippodown, as well as cripple attackers when the opponent thinks you´re gonna Volt Switch after a already burning a Pokemon. Hex is there to deal extra damage to G-Corsola and Dragapult.
Sylveon's role is to soak up special hits and play cleric with Wish, the EV spread I put on it isn´t calced or anything, I just eyeballed it and it has served me well, being able to deal with threats like Hatterene, LO Clefable, Hydreigon (Flash Cannon 4hkos) and Dragapult. Altough, if Dragapult has Ddanced they could KO after stealth rock or if you´re weak, I've with it by chipping it with Corviknight IH and then RK with Conkeldurr EQ. Protect also allows it to scout G-Darm's moves and get HP back with Leftovers.
Seismitoad is here to take on Dracovish and Dracozolt, as well as setting up SR and throwing Toxics around. If they spam Psychic Fangs when you go into Toad, a prediction Hydreigon might net you the game, or you might lose Hydreigon to Outrage, depends on what set they're running. Just make sure to not let it die if they have the Vish on their team.
Corviknight's main role is hazard removal and dealing with Excadrill, if rocks go up, in goes corviknight. Getting SR off the field is instrumental to taking hits with Rotom-H and Sylveon. It's EV spread is eyeballed, but it lives Volt Switches from most rotoms and tbolts from clefable. Taunt is there to stop passive mons like Ferro, Pex and G-Corsola from being able to status you or put up hazards again, and U-turn to safely switch into something, usually Hydreigon if they stay in their passive mon.
I believe this defensive core to be able to deal with most threats in the metagame, while also being able to dish out some good hits.
The teams offense is Sub NP Hydreigon and Conkeldurr. Conkeldurr is there to deal with threats like Bisharp, TTar, Hydreigon and RK G-Darm or threaten it after a VS, UT, or hard predict. Mach Punch OHKOes after it's burned, Drain Punch deals with Ferro and heals Conk up, which it will need since it's taking burn damage every turn. EQ is there to deal with Pex and Things like Dragapult. Facade does heavy damage to Clefable, Hatterene and Mandibuzz. It does have trouble with Balloon Aegislash however, as Conk won't be able to touch it.
Sub NP Hydreigon isn't anything new, and it's proven to be a deadly mon to passive teams and even being able to get key kills agaisnt offensive teams if you predict right, usually after a double sub. You have to watch out for Dragapult, but Sylveon is there for it.
The main problems with the team is Toxtricity, being able to almost OHKO Toad with Specs Boomburst, and being a threat to Sylveon and Corviknight. Heavy prediction is required when dealing with it.
Twave Air Slash NP Togekiss is also a big ahole for the team, as it can hax out sylveon and deal big damage to rotom after a NP, while being able to sponge up hits and recovering with leftovers. Hydreigon's Flash Cannon can dent it, but you have to play around it very carefully.