Alrigth, I've waited enough, I'm going to do a few nominations:
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D --> C / B- : More the old Mega Pokemon are realeased and more Cofagrigus's viability increases, his unique ability Mommy is extremely useful for Balance and even Stall teams against Mega-Medicham, Mega-Mawile, Mega-Pinsir ( a boosted Return hurts, but once he touch you he becomes way less threatening if he's staying) and the rare Azumarill. Unfortunately for Cofag, Toxic Spikes are less useful in CAP than in OU because of Colossoil (which is a big threat, but the flame Orb variant becomes powerless if he decide to hurt Cofag), Crucibelle ( the Mega doesn't like losing Magic Guard either), Mollux, Fidgit and Plasmanta, but are still usable. Finally, we all know that Trick Room is a very effective playstyle in CAP, and that Cofagrigus is a great abuser of it : Never Ending Nightmare at +2 does a very large amount to Special Walls like Celesteela or Mollux. At least, I'm sure that Cofagrigus is way more viable than anything else in D rank, and when Mega-Lopunny, Mega-Altaria, Guts Naviathan, Triage Revenankh, Technician Arghonaut and Wild Charge Krilowatt will all be realeased, I'll probably ask for another rise.
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C --> B-/B : Just like I've done in ORAS one year ago, I'm going to support Gastrodon rise. It already checks many threats in standard OU like Greninja, Ash Greninja, Tapu Koko (none of them use Grass Knot right ?), Rotom Wash and rain teams, which just gains Mega-Swampert, and is an effective playstyle in CAP as well. In CAP, it provides a solid counter to Volkraken, Mollux, Krilowatt, Naviathan and Plasmanta, and since three of them will be buffed after updates, Gastrodon's viability should increase as well. Despite ythe fact that Gastrodon doesn't provide much support to your team, the number of things it checks/counters makes it a very solid Mon in the current Metagame.
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Unranked --> B+ : I think that Mega Swampert is just as good as he was last gen under Rain, which is a weather quite helpful for some CAP Mon, so Rain is still a good playstyle and Mega Swampert is in my opinion the best Swift Swimmer, even though it struggles a bit aginst Tomohawk who can just Roost and waiting for Rain to disappear.
I also agree with the four nominations above my post.