I would say Unburden can be used to take advantage of clones of Bolt Beak.
I think before we decide on bans we should cover the roles Pokemon serve, and review all of our offensive and defensive checks.
Overall, we need to know who are the main Physical, Special, and/or Mixed Offensive Threats sets, the Physical, Special, and/or Mixed Defensive Checks sets, along with Supportive or Disruptive tactics, and most importantly, the main and right uses of Dynamaxing to make moves have huge advantages.
This isn’t just about abilities and moves, but downright stats and typing, and anything signature to them.
I think we should come up with a rough Role Compendum and Viability Rankings list, from here we can come up with common and useful counter strategies and really lay out what it takes to win against something else. For example, Beedrill-Mega was a Pokemon no one saw coming to dominate the metagame as that perfect offensive pivot it became towards the end of the generation. It wasn’t just some random ingenious strategy or specific moveset that propelled it to the mid-higher tiers from the mid-lower tiers, it was simply realizing it does so many thing against the most common Pokemon of that generation like offensive threats in MMY, Tyranitar-Mega, and Xerneas and covered things on defensive threats like Audino-Mega, and others like Gyarados-Mega, Kyogre-Primal, and non-Flash Fire Dusk-Mane.
Basically, people read through the list of what stands out on top and thought, “why aren’t people using Beedrill-Mega (more), why are people sleeping on this?”
In order for us to recognize what is truly powerful, and thus possibly too powerful, let’s just lay out what is the current top-dog, and see what is a directly viable list of things that can stop it, I.e. Fur Coat, Unaware, Prankster, Ice Scales, Sturdy, and then list out the types that resist its moves (the defensive check needs to be resistant to Steel, Fairy, Ground/Fire for Zacian, like Levitate Steels, or Flash Fire Corviknight - but must watch out for CBand 4 attack sets with Fighting coverage, or Beak Bolt). Thus Fur Coat Doublade seems like a huge boon because it can switch in on Spikes, and survive even 2 V-Creates:
252 Atk Tough Claws Kyurem-Black V-create vs. 252 HP / 252+ Def Eviolite Fur Coat Doublade: 112-134 (34.7 - 41.6%) -- guaranteed 3HKO
Once we see things for what they are, we are not theorymonning anymore, and we are actually playing the game - replays, Calcs, strategies, etc.
On a side note: Literally, where are all of the good Water-types? Pokemon Master
E4 Flint must have used Infernape to toast em. You cannot train past perfect
P.S.
For these lists let’s just list S and A+, A, and A- rank for Offensive checks, and Defensive checks - specifically their abilities and most likely moves/items.
This means we can directly consider A checks B, but C checks A, but B checks C, etc. and not just panic into quickban ideas if a general wall/idea is checked by something common; where there may be a teammate that can cover that weakness very well and become a standout option to counter strategies that people didn’t realize it could.