Type Change: Flying/Fighting
Stat Changes: +40 Attack, +15 Defense, -15 Special Attack, -30 Special Defense
Ability Changes: +Dazzling, +Hustle, -Zephyr
Movepool Changes: +Psychic Fangs, +Brave Bird, -Extreme Speed, -Oblivion Wing
Justification: Still potentially a very intimidating Scarf sweeper, but one with a lot less immediate panic to deal with. Its more powerful physical sets have more counters and are less reliable thanks to Hustle, while its special sets are less powerful than they were, albeit with increased power behind Aura Sphere. Drain Punch is also a worse recovery move than Oblivion Wing and hits less of the meta super effectively.
Type Change: Ghost/Dark
Stat Changes: +30 HP, +10 Defense, +10 Special Attack, +35 Speed
Ability Changes: +Corrosion, -Cloud Nine
Movepool Changes: +Sticky Web, -Recover
Justification: Cursola is now a stall team's nightmare, annihilates Doom Shuffling Duraludon, doesn't die quite as horribly to physical Necrozma or Unown-S, and is only viably hit super effectively by Zacian, which is also mitigated by its increased HP. Its biggest weakness in this state might end up being itself, as this Cursola would probably be run with an offensive utility-focused set involving Toxic, a reliable method of cutting through its nasty bulk.
Ability Changes: +Mega Launcher, -Rain Dish
Movepool Changes: +Origin Pulse, +Aura Sphere
Move Changes: Scope In now boosts Special Attack instead of crit rate.
Justification: Octillery was missing an all-purpose nuke, and Origin Pulse gets the job done. While Water isn't the most valuable attacking type, it hits most of its switch-ins at least neutrally, and its base power is boosted to an insane 165 with Mega Launcher. Add Scope In further increasing its Special Attack and helping Origin Pulse's iffy accuracy and Octillery is nearly unstoppable once it boosts. Aura Sphere is a nice secondary option that also offers great power and slightly better coverage than the stronger Origin Pulse.
Stat Changes: +20 Attack
Movepool Changes: +Mach Punch, +Swords Dance
Justification: A Weavile that hits harder and hits more things. Fighting is, right now, a much more threatening offensive type than Ice, which along with SD greatly helps its offensive presence.
Stat Changes: -30 Special Attack, +30 Special Defense, +20 Speed
Movepool Changes: +Play Rough, +Stone Edge
Ability Changes: +Levitate
Justification: Weezing is currently in a pretty pitiful limbo, where theoretically it fills a useful niche but other Pokemon do everything it does better. There's also only one viable physical Fairy, the low-tier Zacian. Weezing comes into its own as a bulky attacker with respectable power and utility by removing its crippling special weakness to mons like Seismitoad, special Necrozma and Naganadel.