Omastar
C+ -> B+ I think this needs to happen. I like to use Rain a lot cause it's a style that very few archetypes are prepared for. Normally when I build I use Kabutops but as of lately I've been using Omastar and to be honest I think it's just much more efficient in the OU environment than Kabutops is. Omastar has a bit better bulk so its lack of priority is compensated for the fact that it can withstand the majority of priority moves in the tier. Specs Omastar and in some rare cases Life Orb if you want more options for move choices, is honestly much more efficient. I think what solidifies my idea of moving it up is the fact that it has access to Scald. This is in a similar vein to Keldeo where if the options of what move to use next is a tough one, it's usually safe to just use Scald and fish for a burn, on top of the fact it's more than likely Rain boosted + Specs. The way Omastar is usually ran in terms of spreads allows it to not be total deadweight without Rain as well as 209 speed (assuming Modest) isn't that bad against stuff like TTar and some of the slower threats in the tier. I'm for this moving up due to it being a fast, fantastic wall breaker in Rain.
Doublade
C- -> C I'll be honest, I think Doublade should stay in C- in terms of how viable it actually is. The thing is, I believe that it's better than some of the C ranks so I'm going off the fact that it should reside in that ranking. I think Doublade is a fantastic check to some of the wallbreakers in the tier. The problem I think is that when Doublade is put on a team to handle these threats, it's given the illusion that it's a more efficient team player to handle M-Hera, M-Garde, M-Cham, when in reality the team is inherently a bit worse in losing something to handle more stuff in the tier. Sure we can argue that those 3 mentioned threats are pretty big, but then we miss so much stuff to actually handle such things as AV Azu, Thundy, Landos, Charizards, Keldeo, the list kind of goes on. Doublade needs to be built around a specific build to actually synergies properly and because of that I believe it should either stay in C- due to its apparent flaws, or move to C cause it's better than some of the stuff there.
Azelf
C+ -> B- Ok I've been seeing this a lot on hyper offense. It's pretty easy for Azelf to set up on a lot of stuff especially when it's backed up by wicked strong power houses, which it usually is. I'm going off of its Screens and Lead set with Explosion for moving this up, as I think they are good enough to warrant it to B-. Its other sets like LO attacker and Rain support I think are not good at all and doesn't truly reflect its viability what so ever. Taunt helps with stall breaking which is always appreciated, Hyper Offense behind screens is very dangerous, especially within 8 turns when the match might already be half way done by then, and Explosion on the non screen sets is stupid strong and saves HO the problem of switching into stuff when the Azelf player now has a clean slate to begin the matchup fresh. Move up imo.
Volcarona
C+ -> C+ I think Volcarona is an underrated threat in terms of where it stands in its viability. Most times, I see people using it terribly and using these old ass move sets that leaves me scratching my head thinking man they could've used that way better. I think an offensive Volcarona with some good timing can put a dent in a lot of relevant stuff which can make it a monster sometimes. However it does have some flaws you can't ignore such as shitty physical bulk, x4 weakness to SR, wanting to run a good amount of stuff at once. I think though, in terms of how it fairs with the C+ and C ranked mons, its more suitable in C+ than it is with the C ranked mons.
Forretress
Unranked ...... Unranked I'm still against moving this up. This thing is just garbage plain and simple. I'll admit most of the D rank stuff is better than Forretress and sure I understand Rapid Spinners are more in demand than Defog users are in this current meta, but it doesn't change the fact that Forre doesn't really warrant an actual team position on a competent build. We have lots of stuff that does every single role that Forretress can accomplish but better, or it has stuff it can do that is irrelevant for the most part. You know what Forretress does better? Slow Volt Switches and that's it. If momentum Stall is your thing (I kind of used this in the past but apparently it's becoming an actual defined thing now) then by all means maybe you can use it. Other than that I don't see how Forre truly warrants a ranking on this thread. Keep it unranked.