Latias A+ --> S
Latias now provides a lot of the defensive utility Mega Latias did with even more immediate potency because Z sets. It would have risen to S even if one of its big competitors Mega Latias was not banned because of the sheer pressure it puts on most teams.
Gliscor A+ --> S
Gliscor is a metagame defining Pokemon because of its great defensive utility in typing and ability, as well the ability for most of its sets to threaten to sweep and wall break (Swords Dance, Taunt) or be an almost totally impenetrable wall (Sub Protect). It fits nearly everywhere and is always an important team player no matter the playstyle.
Suicune B+ --> A
Many teams are unprepared for Rest + Sleep Talk + Calm Mind sets because they rely on weaker non boosting attackers to check Suicune, such as Rotom Wash, which just become set up fodder. It can even stall out the rising Seismitoad despite Water Absorb in some situations.
Tentacruel B+ --> A-
Incredible amount of utility in checking numerous threats, setting up Toxic Spikes, and spinning away hazards. It helps that it is emerging that Tentacruel is one of the only good Rapid Spin users to be able to fit on bulkier teams
Heracross B+ --> A-
Heracross is the one of the tier’s top wallbreakers (if not the very best) because its Flame Orb set can’t be stopped by any common walls and lasts long enough to do extreme damage to slow bulky teams. It is also thriving with the removal of Mega Latias because that was one of the few Pokemon used on defensive teams that could check Heracross.
Muk Alola B+ --> A-
One of the only total stops to Latias, Muk Alola offers balance teams an extreme amount of special bulk and utility in trapping to check or even counter threats they normally struggle with, such as Primarina. It is also an underrated wallbreaker since Muk Alola cannot be Toxiced and does sizeable passive damage if Knock Off removes Leftovers and activates Poison Touch
Sylveon B --> B+
A balance staple which is great role to be right now because balance is rising in usage. Although it has trouble with some strong attackers and most boosting attackers, the amount of utility Sylveon provides while still packing a decent Hyper Voice to discourage set up means it should rise.
Florges C --> B
There is no reason Florges should be so much lower than Sylveon, Sylveon is almost certainly better because it uses Wish Protect more effectively and Wish is more useful right now, but not more than one rank.
Seismitoad B- --> B+
Still not as good as Swampert because Swampert is both a lot stronger and bulkier, while people often underestimate the utility of Roar for rising threats like Suicune. But the great ability makes it nearly as good as Swampert.
Chandelure B- --> B
Several previously uncommon sets have been used recently, but the main reason overall for the rise is that all Chandelure sets are a very good check to Scizor which is as dominant as ever. Chandelure can abuse Scizor with interesting sets like Ghostium Z Calm Mind, Will-O-Wisp Hex, and even Trick Room Weakness Policy. Choice Scarf Sets remain relatively ineffectual however due to slightly below average speed.
Mantine B- --> B
A very reliable Defogger for most balance teams that offers more reliable bulk than Tentacruel because of Roost which lets it check threats like Cobalion and Scizor fairly easily through out the game.
Mandibuzz B- --> B
Mandibuzz is great versus Klefki offense teams because of its Prankster immunity. it also benefits from the fact that plenty of teams are now using Freeze dry Mamoswine, which struggles to 2HKO even Physically Defensive Mandibuzz.
Kyurem B- --> B
Rising mainly for reasons outlined in this
post, Kyurem is simply stronger, more reliable, and more useful than the rest of the B- Pokem
Umbreon C+ --> B-
Really messes up some Volt-Turn teams that rely on Choice Band Scizor because Foul Play does a lot of damage and Umbreon can Protect Scout and even out speed Scizor sometimes. Yes it has problems with Fairies and Fighting Pokemon but the balance and stall teams Umbreon thrives on usually has switchins to those Pokemon.
Moltres C+ --> B-
Somewhat anti-meta right now because of how well it beats threats like Scizor and Cobalion, although the SR weakness is simply terrible but not impossible to deal with. It can actually deal quite nice damage, particularly with Z Hurricane and can even be one of the top Rotom-Wash lures with Z Solarbeam.
Honchkrow UR --> C-
It is certainly usable and I don't see any reason to antagonize users if they want to see it ranked. But to be clear, Honchkrow is not good usually because of bad bulk and competition.