What I'm starting to like about this format is yes, it's centralized - but every Pokemon has a couple of viable sets. Except for maybe Chandelure, there is no "bread and butter set". Also, you can't just spam "fast thing with Shadow Ball/Specs Chandelure" because of Destiny Bond gaming. Also, official monotype competitions are fucking cool, and I sincerely hope that Gamefreak continues with them.
Let's talk Gourgeist. There hasn't been much discussion on it. I know some people can say "just don't bring it to battle" but I dislike the idea of throwing away a team slot and only having 5 mons to choose from instead of 6.
Trick Scarf is imo the best Gourgeist set. Sableye has massive 4mss, you can't use it on Mega Banette, and Froslass is frail with less safe opportunities to Trick; Gourgeist has a real niche when it comes to viable users. Sadly you still lose to regular Gengar by four points.
Trick has great synergy with Frisk, as there is no guessing game on whether their Banette/Gengar is holding their Mega Stone or if they're choiced or whatever, easing prediction. What purpose does Trick have? Disrupting Sableye, removing AV and other nonsense, forcing switches, all kinds of fun things.
Other probably viable sets:
Disable: Doesn't have to be a set on its own, but definitely a move to be considered.
You can use it to Trick Room, although imo Cofagrigus or Spiritomb are better choices to set it up.
Bulky Worry Seed: ruins Prankster, Infiltrator, Flash Fire, etc. Hypnosis has atrocious accuracy and people seem to prefer Swagger/WoW for status so Insomnia isn't very useful. Worry Seed definitely has its niches.
Flame Charge: Yes, Serebii isn't lying, it really gets this. You can go for the poor man's fast Destiny Bond too if you want, but throwing out those faster Phantom Forces sounds appealing. The downside is that Chandelure eats this right up and like Scarf, loses to Gengar.
I think the largely special-based and hardhitting nature of the meta makes it difficult for Gourgeist to run a traditional defensive WoW set. I also don't think that kind of set makes use of its unique assets. Thoughts?