CorruptedOmega
Banned deucer.
Trick Room takes a bit of a hit with the loss of Porygon2, now making Hoopa even better at shutting it down (Fake Out immune Ghost-type attacker w/ Hyperspace Hole to hit Hariyama). I'm glad to see this thing gone, because although it can't deal damage it basically guaranteed Trick Room would be set.
Thankfully Landorus moved up, imo it was a bit much for the tier to handle. It 2HKOd pretty much everything that wasn't immune to Ground, and on top of that it had fantastic coverage allowing it to hit a lot of the tier for heavy damage.
Victini will fill the hole left by Landorus as the one-stop check to Steels, and also can be used as a shitty TR setter I guess. A top tier threat for sure.
Welcome back to Mew, who now made Char-X even better. It brings a nifty supportive movepool, including fast Fake Out, ilTransform, Tailwind, etc. Char-X "bunnies" style teams will absolutely dominate the ladder, although they won't be legal in tournaments (thank god).
The other drops/rises are pretty insignificant