Dhelmise (Ghost) B=>S (Or at least A)
In the past week or so there are three pokemon that I have seen on every ghost team that I have gone up against. They are Gengar, Mimikyu, and Dhelmise. Dhelmise is the only one of these that is not S tier. Dhelmise has above average attack and defense for fully evolved ghost types as well as average hp, special attack, and special defence. Although its speed is horrible it can be put into a trick room team. Along with this it also has an amazing ability in steelworker which essentially gives this pokemon an extra STAB without any drawbacks. Dhelmise is just an outstanding pokemon overall and deserves way better than to just be in B tier.
Alright so, no offense, but Dhelmise sucks. It gets hard walled by a lot of things, with no recovery to back its longlivity up. The only thing it can do is spin, which isn't that popular since you have a handy - dandy hazard control tool in Mega - Sableye. Its only real niche is the TR team, which STILL isn't huge enough to bump it up to A. I do not have replays of Dhelmise, since I have tried it early in the meta and have found Gourgeist much more useful as a Grass/Ghost mon.