I think Tyranitar should go up in tier, probabily A
Tyranitar B -> A/A-
I see a lot of strength in this pokemon both as a wallbreaker, climatic sand teams, or even as a wall defensive/sp defense
It is very versatile, has good stats, and is present in the metagame.
I don't want to go into depth, but I also see a possible drop for landorus in the near future
Landorus-T S -> A+
He hasn't been the king for a long time, since Scrappy and Inner Focus became immune to Intimidate, he lost strength.
Now new movements have arrived, and he hasn't benefited from anything.