Klefki: A- ----> A, Agree. Klefki is very good at it's job setting up spikes and spreading skillful yellow magic. It can run Magnet Rise allowing it to set up Spikes even on EQ spammers. Having a decent last slot option in Play Rough/Dazzling Gleam/Flash Cannon, allowing Klefki to beat MDiancie and MSab kind of. Klefki is also a good Lati switch in as well as a non Heat Wave Torn switch in. It may not be the best mon in A if it gets moved up, but I think it does its job well enough to get the promo.
Azumarill: A+ ----> S, Agree. This thing has 2 actual counters. Mega Venusaur and Mega Aggron. Both take up a mega slot so if you don't build around these, you do not have a 100% safe switch in to this thing. Tentacruel is seen as a guaranteed switch in, which I don't get. It is 3HKO'd by a band Play Rough and takes around 60% from a CB Knock Off. And Tenta has no recovery making it shaky. 3 main sets that are all very effective and almost beat the entire metagame, worthy of S rank.
Garchomp: A+ ----> S, Disagree. I like using Garchomp, but I dislike using it at the same time. Imo, and I am probably going to get heat for this, but I think chomp is overhyped. Yes it is amazing at its job as a rocker and defensive pivot and a phazer. It punishes U-Turners like no other Pokemon in the game, and with it being so common this is amazing for chip damage. It just has a lot of checks that force a switch which can lead to set up/a hard hit. Garchomp does have other sets including offensive and scarf, which are nice sets but again I don't think they are S worthy. Probably a lack of description here, but it is because I am bad.
Reuniclus: B+ ----> B, Disagree. Though I do not have enough experience facing/using this thing, after watching enough battles with this thing putting in the finest of work setting up CM's and cleaning late game, I don't think this thing deserves to drop at all. It is on par with other B+ ranks for sure... And God forbid it falls in the same rank as Bludz!!!
That's all I have to say for now, I am sorry if this seems a bit lack of description, I just came on and saw the discussions were this, and I would like to have my opinion known. :]