LC is an offense oriented meta compared to defense, because of the level 5 mechanics favor offense and it scales much higher compared to defense which is why stall is not existent at all. I suggest watching this video which goes into in-depth of why stall is bad.
With lots of sweepers and wallbreakers, it naturally becomes a HO meta. The best set-up sweepers and breakers at the moment are Grookey and Scraggy.
Sun is the best weather with Vulpix being its setter. Second is hail which is also usable as Amaura also providing Aurora Veil support. While Sand has a natural setter in Hippopotas, Grookey is very troublesome which is why sand isn't that good and popular. Finally, Rain sucks a lot due to 1. Not having a Drizzle Pokemon means you're relied on Rain Dance 2. Grookey wrecks you.
Terrains aren't that great. They don't offer much power now compared to the 1.5x boost back in SM, and they just end quickly. You can't run a Terrain Extender over Life Orb / Eviolite because you lose a lot in power/bulk.
Still, if you had wanted to try a Grass Spam team here's a team with SD Unburden Treecko + Grookey.
The best HO right now is undoubtedly Webs. After Vullaby ban, It's been even considered to be suspected or can be quick banned. Just a tl;dr is that Scraggy under Webs is broken and easy to spam. The best Web setter is Dewpider and abuser is Scraggy.
While using Webs, you have to take care of stuff like Magic Bounce Natu which is problematic, though with a bit of right plays you can get around it. Apart from Webs, there's also Onix and Dwebble HO which are just as good with mainly comprising of hazard stack aka Spikes. Here's a Sun HO + Dwebble that's very easy to use and good as well.
That's all, hope I helped!