Ability Pass
Premise:
You can pass their base ability to teammates by switching.
Potential Threats and Bans:

To no one’s surprise, Huge/Pure Power, STag, Atrap, Sand Viel, Snow Cloak, and Moody will most definitely be banned. There is no debate. Anyone with a functioning frontal lobe can tell you that letting any Pokemon potentially have these abilities is a bad idea.
And no offense to the AAA council who haven’t banned Sand Veil/Snow Cloak yet. I guess we’ll have to wait for UT to lose an important game against Sand Veil.

(when released)

While more debateable, still very much ban worthy, Fur Coat and Ice Scale passing could definitely be broken. It would be like having a Perma Reflect/Light Screen up for any set up sweeper. However, this is (potentially) more acceptable because it’s easier to plan around than giving something like Breloom Huge Power or Polteageist Simple. You can switch your Special Attacker on Persian and Physical Attacker on Frosmoth, and usually threaten out the set up sweeper. Even so, Ice Scales will definitely be looked at early on and Fur Coat eventually too when Persian-A is released.

With how the metagame works, Cyclizar will not get to use its own Regenerator, which is potentially let it drop. Meanwhile Orthworm can pass its Earth Eater ability to threats like Ceruledge, Iron Thorns, Magnezone, Kingambit, Cinderace, Iron Moth, and set up variants of Skeledirge.

Corviknight is an extremely adaptable Pokemon. Since you can pass Corviknight multiple abilities, it can deal multiple different situation. Best way I can describe it would be to say Corviknight would be like the TF2 Vaccinator, where Corviknight can have Volt Aborb, Flash Fire/WBB, Intimidate, Regenerator, Unaware, Purifying Salt, or something else. Making it a prime target to eliminate.
Questions for the community:
-A need we would need to discuss is the details of the mechanic. Like when the ability should apply? Like if you switched from PS Garg to Intimidate Gyarados, when would Purifying Salts be applied? It can be applied before Intimidate is used, after it’s used, at the end of the turn, ect.
-Another detail would be how to define “passing abilities”. More specifically, should passed abilities be added on or replace current ability? This is a pretty important change as it determines a lot of strategies and viability of Pokemon. Like Slaking for instance would be broken with Abilities being replaced, and just as terrible with Abilities being added. Or strategies like Protosynthesis+Unburden being possible when Pokemon can keep their abilities, or Unburden being a less flexible ability.
So basically, which sounds better for this meta?
-We also need to talk about abilities like Battle Bond, Stance Change, and any ability that otherwise can’t be changed or given. How would those abilities function? Additionally, how should things like Trace, Transform, Role Play, Skill Swap, ect. all function with passing abilities?