I think we all agree that, right now, the meta needs some change in one way or another. Here are, in my opinion, the three bans that would make the meta healthier
1/ Water bubble: the fact that, in order to have a reliable check, you must run an ability whose only function is to check it, is dumb. In addition, the new move core enforcer makes it even more annoying due to the ability to hit potential counters such as giratina or the semi-viable Water absorb primal groudon. Having to run xerneas or magearna over other better defensive mons such as solgaleo even adds to the issue.
This ability is overcentralizing (since it forces to run a niche set on every balance team), while not adding anything to the metagame (while shedinja and Chansey are great diversity inducers)
2/ Comatose: comatose is an extremely niche ability, that would only be good on 'mons that want both status immunity and power increasing items, and fear nuzzle/scald so much that they do not want to use magic bounce. Otherwise, Comatose turns into a hugely uncompetitive ability due to the combination of sleep talk+shuffling.
While it does have some counters, it has a way to bypass all of them: psychic terrain for priority, dragon tail/circle throw for magic bounce.
What probably is the biggest issue is that it is highly unpredictable and requires very little dedicated support. Almost any pokemon with over 90 speed can succesfully run a comatose scarf set. As long as it doesn't come out, it is impossible to know if you can sacrifice your magic bouncer. What adds to the issue is the fact that said magic bouncer will often be something like giratina that checks some much stuff that it can be easy to overthrow via a coverage move. Finally, the fact that hazards are required for the set to work efficiently isn't even such an issue, as they benefit any team immensely.
Basically, comatose addition to the metagame is strictly negative, as it brings very little competitive sets while being potentially extremely frustrating (the simple fact that a new player could not be able to act for 16 turns consecutively makes it ban worthy since you can be sure that player is never coming back to BH).
3/ Psychic surge: deoxys-A spam/genesis supernova/MMY is a known issue, that is quite tricky to fix. My proposition is to ban psychic surge because:
- it fixes the problem of deoxys-A spam: water shuriken single-handedly destroys these teams without psychic surge. Yes, there is still some counterplay, such as using fakespeed galvanize deoxys-A, but water shuriken is already decent on many specially offensive mons (such as palkia). Consequently, the resource necessary to take it on would either be too important, or bring enough diversity that this archetype would just be one of the many "let's spam the same mon with different sets" teams.
- if fixes the problem of the offensive capabilities of MMY. Mega mewtwo Y is extremely painful to switch into without something like solgaleo. Without this issue, MMY turns into a one time problem, as it can be revenge killed with priority afterwards (not to mention the fact that nova isn't boosted by psychic terrain is already a big deal).