Hey
TPP, nice list! Here are more of my changes.
Choice Scarf Clefable can easily annoy Pokemon by tricking a choice scarf onto them, such as Chansey/Blissey, Toxapex, Hippowdon, Mandibuzz, etc. it doesn't abuse it as much, but I believe it deserves a spot here.
Physically Defensive Mandibuzz has been drifting more to physically defensive as the metagame changed, mainly to better deal with threats like Rillaboom, Alolan Marowak, and Excadrill. You can keep it in the 'Mixed Sets' section, but mentioning this set would be nice.
Offensive Pivots With U-Turn, Urshifu is a strong breaker that can bring in many Pokemon.
Defensive Pivots Blissey is a much better pivot than Chansey thanks to HDB + Teleport, so it definitely deserves a mention.
Defog Galar Weezing is a niche pick on balance teams that can remove hazards with Defog, so I would add it along with the other Pokemon included.
Offensive Pivots They both have pivoting moves (Volt Switch, Flip Turn) and a decent amount of offensive presence this gen.
Choice Specs I don't see Keldeo too much lately, but Choice Specs can break through things pretty hard paired with a high Speed stat.
Choice Scarf Like Clefable, Choice Scarf can be used to be tricked onto passive Pokemon, while Gengar is also great offensively and maintains a high Speed tier with it.
These are just my picks, add what you feel is right.