Gallade moved from OU to UU
Eh, who cares. Gallade itself is pretty mediocre. Assault Vest or Bulk Up could be okay but I highly doubt it will do anything to the metagame.
Alakazam moved from UU to OU
Huge blow and boon to Hyper Offense here. Zam was HO's greatest ally and enemy. Being able to slap on Sash Zam to help deal with Mence, Luc, etc. was so nice and I hate to see it go. Life Orb was also hella good as
King UU has shown in UUPL recently. Overall, a solid and interesting mon to play with gone and it makes me just a little sad u_u
Mamoswine moved from OU to UU
As threatening as this will be, base 80 speed is going to let it down in a big way. Stuff like Lucario, Heracross, Entei, and a bunch of others will outspeed and threaten it out with STAB moves. Still a monster and a real pain in the ass to switch into but I think at least for now it's going to struggle if the meta shifts offensively. Ground Ice STAB is gonna be really fun to watch though.
Hippowdon moved from UU to OU
Knew it was happening eventually. Hippowdon was cool but ultimately never that good. The omnipresence of at least 1-2 water types on every team really held him down. Still, hate to see him go as Stoutland is unfortunately going to die with him, RIP you magnificent beast.
Mandibuzz moved from OU to UU
This will be interesting. Mandi is really fat and annoying so I'm not really looking forward to dealing with it. However, since Mandi will likely be the defogger I think it will be really pressured by not being able to switch into the tiers heavy hitters. This will prevent it from Defogging as often as it would like, which could be a slight downside to this carrion bird.