This is my first competition, pretty much my first attempt at remotely serious competitive battling at all, and also my first post on Smogon.
I had a couple of disconnects and my win-loss is something like 8-5 or 9-4, which I'm reasonably proud of. I think I'm weakest on predicting what the heck the other guy's going to bring out of his six, and I often don't recognize the Pokemon because I've been largely out of the loop since Gen 2, and had not read up on Ultra Beasts or Tapus yet because I just dove straight into breeding.
My team is bog standard Ninetales, a bulky Incineroar, and a RestTalk Impish Mudsdale with HP/SpD EVs who looks weird but gets results. The other three are Golem and Exeggutor with messy coverage sets and HP/Atk Solgaleo with Flame Charge to try and patch up his speed.
Since Greninja can't get Gunk Shot, Ninetales is free to OHKO it with Moon Blast. I lose Aurora Veil to Pelipper, but the rest of my team is weak to Water or Flying one and Freeze Dry maims it at the least. Ninetales has also OHKO'd all three Zygardes I've seen thanks to its 4x Ice weakness, though I may be getting lucky on that (or people are running imperfect Zygardes I guess).
A lot of folks don't realize how badly Mudsdale with Stamina can just stop a physical attacker (the highlight of my night was Toucannon deciding to use Bullet Seed, getting about 1/4 of Mudsdales health, and then never taking meaningful damage again). It packs just enough punch and enough bulk to do its job of Earthquake and Heavy Slam coverage.
Incineroar is a workhorse, taking 25% or less from Moongeist Beams and Darkest Lariat off even base attack getting plenty of 2HKOs. I've also seen plenty of folks who don't seem to realize that Fire resists Fairy.
The only awful thing I've run into is Minimize Soft-Boiled Blissey. I knew I should have squeezed Toxic in somewhere. (I also saw a Minimize/Calm Mind/someotherboost/Stored Power Clefable in BSS when I was practicing. I still hate that person, even if it was sort of hilarious.)
I've enjoyed the whole experience a lot - I usually know why and when I messed up, and I've made some solid plays and predictions in battle. I'm also still at the point where the other guy making even an ignorant mistake is an exhilarating break in tension. If I can get better at the 'pick 3' part of the format I could at least make every match close. Maybe tonight I'll pay a bit closer attention to whatever shenanigans I see.