^There is a tradeback guy in Slateport where the Name Rater used to be^
Might as well report some new things i noticed after playing around a bit more:
-Wild Beartic seem to have Snow warning instead of Snow cloak for one of their abilities, the pre-evolution Cubchu seems fine though.
-I managed to get 3 Megastones from Gym leaders: Roxanne, Brawly and Juan. All 3 had the same dialogue stating they gave me Aggronite
-These 3 Gym leaders also offer rematches any time you talk to them compared to the rest where you have to wait a day between each rematch (it's why i could grind their stones so fast)
-Roxanne's dialogue is a bit wonky the first time you beat her
https://imgur.com/a/W9B5nq8
-You can use Thief/Covet to get a Megastone without having to beat a Gym leader
-Choosing to Fly on the square right next to Fortree city leads to a funny scenario where you can walk on water (you have to enter scorched lab to get unstuck)
https://imgur.com/puVVfsS
-Still no idea how to get a Galarian Weezing (Level up while holding the Souvenir doesn't seem to work, though it works on Alolan Exeggute). Maybe Galarian forms aren't fully implemented yet since the pokedex also doesn't really list them as alternative forms.
-Dusk Lycanroc has Vital spirit as its Hidden Ability and Sand Rush/Tough Claws for the other two. Maybe you can get an illegal combination but it's not really an issue.