gtg soon so im gonna be brief here. theres lots of pokemon that I believe should move:
skarmory A+ -> A
skarm is not that great. the defensive set definitely does not deserve a+ as it is far too passive and easily taken advantage of by like half the meta, or even trapped by magnet pull users such as mega manectric. It does have a quite cool sd gale wings set, which is pretty good, but not as good as staraptor and braviary.
mew A -> A+
mew may run the exact same set it runs in ou, but the difference is aaa it can run whatever defensive ability it wants. prankster is the most annoying thing ever, poison heal gives you status immunity and non-knock offable passive healing, regenerator is good, flash fire/water absorb or those new weather abilities to fuck over weather teams and all the fire spam in this meta, volt absorb to stop volt switch spam, hell, you can even run mold breaker for things like magic bounce chansey. mew is sooooo fucking good, I have no idea why its not a+
lucario A- -> A+/S
ive talked about lucario before. its tough claws set is godlike, especially with pursuit support. tough claws espeed is sooo good for just wrecking offense, and +2 cc will kill anything that isnt a bulky resist (such as mew!) here are some replays I saved from last time i brought this up:
http://replay.pokemonshowdown.com/almostanyability-171091304
http://replay.pokemonshowdown.com/almostanyability-170799963
http://replay.pokemonshowdown.com/almostanyability-170819981
http://replay.pokemonshowdown.com/almostanyability-171007913
http://replay.pokemonshowdown.com/almostanyability-171056253
snorlax, goodra, and regirock B+ and A- -> A
ive put them together because they're basically the same thing; 3 amazing walls that rely on poison heal/regenerator. these are imo some of the best walls in the game, they just wall so much. regirock stops victini, birdspam, and so many other physical things. goodra and snorlax wall almost everything on the special side, while having very good offensive presence, not being passive like chansey. they also have the very important niche of countering sheer force gengar. speaking of gengar...
gengar A- -> A+
ive talked about this before too, and I believe gengar deserves A+ because of the sheer power of its sheer force set. it has 2 very important qualities that give it a strong niche: the first is that it literally has no counters other than snorlax and goodra, and snoralx is shaky thanks to focus blast. this makes it an extremely powerful wallbreaker, and will completely demolish both stall and balance, especially if given hazard support to overwelm goodra/snorlax. the second is that it is a ghost type, making it an excellent extremespeed check in this meta where most people are running tough claws on their extreme speed users and not refridgerate. (although it cant live +2 lucario bullet punch, lucario2strong.) so yeah, gengar for a+ plz.
aegislash A- -> A+
come on its aegislash, wtf is it doing in A-
latios A- -> A+
similar thing to aegislash, it is still a really good poke, and it gains adapatabiltiy allowing it to de fucking stroy everything. heatran, aegislash and other steel types, aka the only switchins to this get worn down quickly due to so many of them lacking recovery
mega manectric unranked -> B+
a really good pokemon that works as an offensive birdspam check, can also run magnet pull to trap skarmory before mega evolving (thanks word), really good at cleaning teams and volt switching to provide momentum against stall.
also tornadus-t (drizzle/that new weather ability/no guard), ferrothorn(flash fire/prankster/drizzle for rain teams), dragonite(banded tough claws), honchkrow(only slightly worse than the other 2 gale wings users), and fucking shaymin-s(hello!??!) all need to be way higher.
thanks for reading my ramble, not really that brief is it :D