I believe the council should implement, suspect, or include on a survey the possibility of implementing a 2 ability clause. This would have a positive impact on the tier by encouraging creativity and eliminating one of the most broken archetypes (3-4+ Regenerator spam) from the tier.
Part 1: The current meta is suffering and Regenerator
is not broken
Regenerator itself is not broken, and the council has supported this viewpoint as well. Regenerator allows increased flexibility defensively and offensively with Pokemon that lack recovery, strengthening all playstyles to some degree and creating new metagame staples such as Regenerator Great Tusk and Regenerator Primarina. The reason why these Pokemon are not broken is because they themselves are often only annoying and rely on their teammates to tank supereffective hits.
But I digress. The problem arises when people begin to
uncreatively spam Regenerator on 3+ Pokemon (yes, I'm a hypocrite) in a team and then easily switch between Regenerator Pokemon to perfectly wall the opponent. This results in extremely boring gameplay of constantly switching Pokemon to create games reaching upwards of 200+ turns for extremely boring draws (balance vs stall) or being helplessly overwhelmed by hazards while trying to damage Regenerator Pokemon properly (HO/stall vs hazard stall), which is furthered by common Regenerator Pokemon such as Great Tusk, Goodra-Hisui, Iron Treads, etc being able to spam Knock Off with almost no punishment aside from the occasional Flame Body. HO players have to resort to using extreme wallbreakers, such as banded Roaring Moon, Choice Specs Raging Bolt/Latios, Rocky Payload Ogerpon-Cornerstone, etc, some of which are the most broken Pokemon to ever be allowed and are only allowed (in my opinion) because of how good Great Tusk and Regenvesters are. Normal stall/setup Pokemon that would simply be nuisances such as Primarina, Goodra-Hisui, etc, suddenly become threats that you somehow need to fully counter while somehow checking the other Regenerator Pokemon, otherwise that Pokemon will simply come back in and wall/set up on you eventually.
https://replay.pokemonshowdown.com/gen9franticfusions-2314701755?p2 (Triple Regen vs Triple Regen hazard stack)
https://replay.pokemonshowdown.com/gen9franticfusions-2312650861?p2 (Triple Regen winning despite losing 2 Pokemon)
https://replay.pokemonshowdown.com/gen9franticfusions-2311196506 (307 turn draw)
https://replay.pokemonshowdown.com/gen9franticfusions-2168602071 (300 turn draw)
https://replay.pokemonshowdown.com/gen9franticfusions-2065976809
https://replay.pokemonshowdown.com/gen9franticfusions-2066740592
https://replay.pokemonshowdown.com/gen9franticfusions-2214654910 (hidin)
https://replay.pokemonshowdown.com/gen9franticfusions-2315547446
Part 2: Impact and
why we should go against policy
Two similar metagames that modify abilities have an ability clause already: AAA and National Dex AAA. AAA has AC, while National Dex AAA has 2AC. Furthermore, if Regenerator is fully banned, then that will fully eliminate stall as a viable strategy and likely require even more bans on Roaring Moon, Raging Bolt, Latios, and other broken sweepers that can be walled by Regenerator Pokemon. Meanwhile, if 2AC or maybe even AC is implemented, Toxapex could be unbanned, Regenerator spam
fully disappears, and players will be encouraged to use other defensive abilities, such as Magic Guard, Flame Body, Tablets of Ruin, etc. Stall will still be able to run 1 physical and 1 special Regenvester, and although some wallbreakers might still have to be banned, that is much less chaotic than completely destroying stall teams and then turning the meta into HO spam.