(unranked) --> C
This is obviously going to be because of Research Week but I'm gonna do a 180 on my initial opinion and suggest that Delphox be ranked, so lets give it a placement at C. Prior to the September shifts, it was outclassed by Victini due to similar typing but overall worse defenses and offenses. However, the Calm Mind set is able to wreak havoc, and thanks to its nice speed tier, its able to punish a lot of bulky offensive teams, as a Calm Mind under its belt lets it wallbreak with STAB Fire Blast and Psyshock while Grass Knot means it can stuff any bulky water, making it unique in its wallbreaking capabilities as a Fire-type. To be honest, this is probably more B- or B material, but the more important thing is that it actually gets placed on the list.
B --> B+
Gligar has been fitting fantastically on many cores, as people are starting to realize that SR and Defog shouldn't be used on the same set. U-turn has been making a comeback, and synergizes well with a lot of U-turners and especially Volt Switchers. SpDef Gligar has also become an intriguing set, making it a very efficient mixed wall that can take on LO Hydreigon while acting as the best Mega Amph counter in the tier (HP Ice is shit). The set is still able to counter Lucario, one of the hardest Pokemon to even check, so I think it's time for people to stop hating on Gligar because of its NFE status and let it rise to B+
A --> A+
Anybody who has been playing recently has noticed the drastic influx of Krookodile, with CB, SR, and Scarf all becoming top tier sets that fit onto teams to provide a sturdy Luke check, Pursuit support, and strong EQ/Knock Offs. Thanks to Intimidate, it can even trap Jirachi and Crobat which can sometimes be the only roadblocks for Fighting-types like Lucario and Grass-types like Roserade and Shaymin.
B+ --> B
While Hydreigon is still plenty used, Granbull was moreso for the double duty that it had against Heracross. Jirachi becoming the best Pokemon in the tier as well as sets like SubCM Jirachi, SD Cobalion, and NP Luke becoming much more viable has also kind of put a damper on it. The overall metagame shift has pushed Granbull back down to obscurity, and it's time for it to drop just a tad more
That's all I'm going to suggest for now, as other changes that I had in mind seemed to be much more subjective