Some deep speculation into the meta.
The state of HO in Tundra AG

Klefki might sound odd, but Dualscreens, Prankster and Spikes, can really make it a decent replacement to

Another prankster mon. Grimm can setup screens, and taunt the opponent, something

cannot.
Who benefits?

Dual screens, Prisim Armor, DD, and a lucrative weakness policy, combined with a very strong attack, makes this thing a beast.

Regdon's natural bulk and sheer power allows it to safely setup SD and clean through any non

team.

Natural bulk and SD is insane with this beast of the meta. Zacian will be insane.

AAAAAAAAAA do i even need to explain. Yveltal already has a good HP, and with screens, its sheer power and unwillingness to die, lets it thrive.

Screens and Water Spout are nukes.
The state of stall in Tundra AG.
Stall is suffering. Yveltal has barely any counters and is everywhere.

Ttar, yvel check and decent rocker. Tyranitar walls non Steel-Wing Yveltal, and is pretty decent against

Another

softcheck. Chansey shits on nearly all special attackers and is a

check even though it gained nice physical moves.

This thing can fill EVERYTHING. Rocker, lighter, the best defensive wall, now furthered by

now being Ground, and

not investing much attack, but it's typing is it's achilies heel in a way. Yveltal can come in for free and proced to punch a massive hole.

Hazer and great check to

and

Honorable Mention:

hardcheck is nothing to sneeze at. As well as ruining

plans to breathe air.

are everywhere though now, so maybe it won't be as dominant.