Well on the topic of stat changes..
WEAKLINGS
Metagame premise: At the end of each turn, Pokemon with lowered stats faint.
Potential bans and threats:
Mirror Armor essentially flips the premise of the metagame on its head rather than deal with it, so that's likely banned.
Sticky Webs makes switching out infinitely harder without losing a mon or making your whole team immune, so that's likely banned as well.
Contrary, Clear Body, Mist, Covert Cloak and White Smoke are powerful as a result of preventing lowered stats from existing.
Setup sweepers become generally less viable as all it takes now is a lowered stat stage to get rid of them.
Charm, Sand Attack, Confide, etc. all have extra use in potentially being OHKO moves. This also makes Magic Bounce more appealing.
If Contrary, Clear Body, and White Smoke stay, moves like Skill Swap or Entrainment could see extra use as they get rid of these strong defensive traits.
Slow pivots can be way more useful, allowing you to have your stats lowered, but then get that effectively removed at the end of the turn.
Questions for the community: Are abilities like Clear Body and Contrary too overpowered, or potentially necessary? What about Mist, I'd think that might be bannable? Does this even sound fun? I think the potential for being able to run a bunch of really weird sets is fun, but this meta could also be very prone to having 1 little mistake result in a loss immediately, so there's that.
WEAKLINGS
Metagame premise: At the end of each turn, Pokemon with lowered stats faint.
Potential bans and threats:
Mirror Armor essentially flips the premise of the metagame on its head rather than deal with it, so that's likely banned.
Sticky Webs makes switching out infinitely harder without losing a mon or making your whole team immune, so that's likely banned as well.
Contrary, Clear Body, Mist, Covert Cloak and White Smoke are powerful as a result of preventing lowered stats from existing.
Setup sweepers become generally less viable as all it takes now is a lowered stat stage to get rid of them.
Charm, Sand Attack, Confide, etc. all have extra use in potentially being OHKO moves. This also makes Magic Bounce more appealing.
If Contrary, Clear Body, and White Smoke stay, moves like Skill Swap or Entrainment could see extra use as they get rid of these strong defensive traits.
Slow pivots can be way more useful, allowing you to have your stats lowered, but then get that effectively removed at the end of the turn.
Questions for the community: Are abilities like Clear Body and Contrary too overpowered, or potentially necessary? What about Mist, I'd think that might be bannable? Does this even sound fun? I think the potential for being able to run a bunch of really weird sets is fun, but this meta could also be very prone to having 1 little mistake result in a loss immediately, so there's that.