Heliolisk: I agree with it moving down to B+. There are three sets Heliolisk can use, all of them have their positives and negatives. The best being Life Orb which capitalizes on Heliolisk's great coverage, it does allow Heliolisk to be worn down much more easily. Between Life Orb damage from Volt Switching on Pokemon it can't outright KO (i.e Snorlax, Florges, Blissey), entry hazards, and the opponent scouting coverage, it's easily just brought down to a point it either dies of Life Orb recoil or entry hazards. It's also extremely frail, meaning it can't check a lot of faster Flying-types that it should, especially after all that damage that racks up.
Rotom-H: I agree with this being moved up to B+. I'm all for it moving due to its versatility, as Choice Scarf sets can act as decent revenge killers, Choice Specs threaten a lot of balanced builds, and defensive sets can spread status with ease. As stated in dodmen's post above, it also checks two huge threats in Mega Pidgeot and Mamoswine. There are some flaws that prevent this thing from going to A- imo. The first of which is its weakness to Stealth Rock, which, for a Pokemon that is going to be pivoting most of the game with Volt Switch is quite detrimental. The second is the weakness to Water, due to it being an Electric-type you'll want it to be dealing with the Water-types most of the time and the fact Rotom-H has a Water weakness really sucks. The third is the reliance on a secondary STAB that drops Special Attack by two stages, for offensive variants, especially Choice-locked ones, this is very detrimental, as it allows dangerous setup sweepers, such as Salamence and Feraligatr, to have free turns to setup.
Darmanitan: Darmanitan's move down is inevitable imo. It's reliance on Flare Blitz to punch holes really holds it back considering the immense recoil that comes with it. Not to mention, Darmanitan's not sitting in too good of a Speed tier, with a lot of threats being able to outspeed it and Choice Scarf not being too good of a set. It is going to be pivoting a lot due to the fact a lot of Fire-resists can handily take a Flare Blitz and weakness to Stealth Rock and vulnerability to all other entry hazards aren't helping it. It's also quite frail and easily revenge killed.
Doublade: I also agree with Doublade moving up to A-. It's a great blanket check to a lot of physical attackers and some bulky setup sweepers (especially CurseLax). It's also one of the few complete stops to a Slurpuff sweep. It has some things holding it back from going any further than A- though, such as pitiful special bulk, reliance on Eviolite for bulk, and reliance on Shadow Sneak to hit quicker threats among those problems. Doublade is also one of the few viable spinblockers in the tier. While Doublade is reliant on Shadow Sneak to hit quicker threats, and Shadow Sneak is really weak unboosted, Shadow Sneak has good neutral coverage, only having one resist and one immunity.
Moltres: Not too experienced playing against or with it so can't really say anything.
Alomomola: I'm not too sure on whether to move this up or let it stay where it is to be completely honest. On one hand, it's very passive, giving a lot of threatening setup sweepers the opportunity to have free setup, especially Substitute users. It's also got quite the bad special bulk and is susceptible to Toxic. On the other hand, it's an amazing Wish passer, and checks most physical attackers that cannot setup while being able to pivot due to Regenerator. It's also one of the few great answers to standard Mamoswine (non-Freeze Dry).
Crobat: Another one I'm not too sure whether to move or to stay. It's got an amazing bunch of resistances, including a quad resistance to Fighting, backed by quite decent natural bulk and access to U-turn makes it a good pivot. It's also one of the few Defog users in the tier and can run one of the quicker Taunts in the tier. It's more recently starting to face quite the amount of competition imo from both Mandibuzz and Salamence, as Mandibuzz runs a nice Taunt + Defog set and can have mixed bulk, Salamence has access to Intimidate making it arguably the better Fighting-type check and has access to a phazing move in Dragon Tail. Crobat is also highly pressured nowadays.
Just some thoughts.