Stall is not dead:
Toxapex @ Waterium Z
EVs: 248 HP / 8 SpA / 252 SpD
IVs: 0 Atk
- Sludge Wave
- Baneful Bunker
This is a cool idea but I'm not sold on the set itself. I've been running a Snorlax set based on it to pretty good success though.
Snorlax @ Normalium Z
EVs: 252 HP / 4 Atk / 200 Def / 52 SpD
- Giga Impact
Immunity prevents lax from getting worn down by toxic, z-stockpile allows Snorlax to boost up on anything that can't OHKO it and stay in tip-top shape. Z-Whirlwind boosts sp-def and phases out things like GonZ that might try to match you boost for boost. Z-Curse boosts defence past the stockpile limit and gives a handy +2 Attack. I may switch the Z-Crystal to something that doesn't leave it hard walled by ghost types, but other than that this sets been doin' wonders.
Also yeah, this meta is... kind of exhausting already. It's not unplayable but it'd benefit from losing Tapu-koko, Kyu-B and BB-Greninja IMO. Nothing within Gren or Tapu's speed tier hits nearly as hard as either of them, whereas Kyurem is just a monster.