Alolan Persian: B+ -> A- 100% Agree
Personally I'd probably nominate this Pokemon higher, but I think A- would be ok for it right now. This thing is just absolutely fantastic in the current meta. A more offensive meta basically means that Alolan Persian thrives. Not only does it have an amazing Speed tier + a fast Parting Shot, but its ability to blanket check almost every frail physical attacker in the tier means it can be a blanket secondary check on many offensive and balance team alike. Z-Parting Shot is particularly good, being able to give many set up Pokemon a second chance, like Lilligant for example, while also decreasing the opponent's Attack and Special Attack stats. I'd also argue that it's fairly splashable because it disrupts most teams, from HO to Stall, thanks to it previously mentioned Speed but also Taunt + Foul Play + Toxic being fantastic utility options. In a meta that also favourites strong breakers, having such a potent pivot can very easily shift the balance of a game. Nasty Plot is like B- best but the pivot set is just so good.
I have other nominations that I wanna address, but I'll do that when I have more time!