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Don't let your memes be dreams
Zard-X should definitely not drop, it is one of the best A+ mons currently and neither do I think Thundy or Mega Slowbro deserves a drop. I can see Azumarill dropping to A but I'll reserve that for another post
Amoonguss from B+ to B: While I am a big fan of Amoonguss and I posted something about him a while ago in another thread, I think a drop is pretty acceptable. Amoonguss passiveness makes him only fit on stall or semistall teams. Pokemon that lose against Amoonguss (Keldeo, Non-BD+Knock Off Azumarill and Mega Diancie) have many other viable switchins on stall teams, all of which are less predictable (Mega Altaria as Keldeo switchin, Jirachi as Mega Diancie switchin, Tentacruel as Azumarill and Keldeo switchin) because they can many moves succesfully where Amoonguss can only use 5 or 6 moves. It can be very difficult to wear down but it's predictability makes it very easy to lure in and kill it / prevent him for sporing you.
Looking at the S rank, I don't think anything deserves to go from A+ to S. Mega Altaria is arguably the best candidate for the rise, but I agree with AM's points that at this point it should stay A+. Tornadus-T going from A- to A is not weird looking at the extreme popularity it got in the past few weeks. The AV set is pretty difficult to wear down and is an awesome offensive switchin to pokemon like Keldeo to force them out with a Hurricane and possible get momentum with U-Turn. The LO set with either Superpower/U-Turn/Knock Off or Heat Wave / Focus Blast or Superpower / Knock Off or U-Turn hit very hard and Regenerator keeps Torn-T healthy. You can't easily switch in early game because you don't know the set and any coverage might hurt you, and moves like HP Ice and Taunt can catch you off-guard. It has some flaws being the difficulty to break some walls because it can't run 6 moves at the same time, it has problems switching into moves like LO Psyshock from Lati@s and combined with rocks it is pretty difficult to stay healthy all the time because you can't just switch in every single time. Despite these flaws it is easily A rank worthy.
Amoonguss from B+ to B: While I am a big fan of Amoonguss and I posted something about him a while ago in another thread, I think a drop is pretty acceptable. Amoonguss passiveness makes him only fit on stall or semistall teams. Pokemon that lose against Amoonguss (Keldeo, Non-BD+Knock Off Azumarill and Mega Diancie) have many other viable switchins on stall teams, all of which are less predictable (Mega Altaria as Keldeo switchin, Jirachi as Mega Diancie switchin, Tentacruel as Azumarill and Keldeo switchin) because they can many moves succesfully where Amoonguss can only use 5 or 6 moves. It can be very difficult to wear down but it's predictability makes it very easy to lure in and kill it / prevent him for sporing you.
Looking at the S rank, I don't think anything deserves to go from A+ to S. Mega Altaria is arguably the best candidate for the rise, but I agree with AM's points that at this point it should stay A+. Tornadus-T going from A- to A is not weird looking at the extreme popularity it got in the past few weeks. The AV set is pretty difficult to wear down and is an awesome offensive switchin to pokemon like Keldeo to force them out with a Hurricane and possible get momentum with U-Turn. The LO set with either Superpower/U-Turn/Knock Off or Heat Wave / Focus Blast or Superpower / Knock Off or U-Turn hit very hard and Regenerator keeps Torn-T healthy. You can't easily switch in early game because you don't know the set and any coverage might hurt you, and moves like HP Ice and Taunt can catch you off-guard. It has some flaws being the difficulty to break some walls because it can't run 6 moves at the same time, it has problems switching into moves like LO Psyshock from Lati@s and combined with rocks it is pretty difficult to stay healthy all the time because you can't just switch in every single time. Despite these flaws it is easily A rank worthy.