Volcarona A+ ---> A
1. Volcarona is currently #45 by usage in OU and for a good reason. I haven't seen a Volcarona sweep for like a month. Volcarona can be dangerous, yes, but it is very inconsistent and match up reliant. It won't sweep if you don't manage to clear entry hazards, any team with Chansey or Mantine is safe against Volcarona, it can't break both Pex and Heatran (which are now really common), it is revenge killed by scarf Keldeo and scarf Greninja and it is vulnerable to priority such as Mega Pinsir's Quick Attack and Ash-Greninja's Water Shuriken. Also stuff like Thunder Wave Mew and Thunder Wave Ferrothorn (which is pure evil btw) started appearing, which means it is harder for Volcarona to set up on Pokemon it used to before. You might say that Volcarona sets up on Kartana, one of the best Pokemon in the tier. And yes, it sets up on Kartana, but only on the scarf variant. If you switch in on SD Kartana as it sword dances, you die to +2 AOP. So setting up on Kartana is quite risky and you have to scout its set before attempting to do so.
2. If you're building a team with Volcarona, you need to build the team AROUND Volcarona, you can't just slap it on a team. And most of the time it requires so much support that it almost isn't worth using. First off, you need a consistent hazard remover that can come in multiple times and guarantee that Stealth Rock will be gone. Then you need something that can remove either Pex or Heatran depending if your Volcarona set is Psychium-Z or HP Ground. And lastly you need to take care of anything that's able to revenge kill Volc before you attempt a sweep.
3. The current ranking doesn't reflect Volcarona's performance compared to some Pokemon in lower ranks. I know it isn't really comparable to Hawlucha, but both of these Pokemon have a similar role, they're late game sweepers. So I'll compare them anyways lol. Hawlucha (currently in A rank) requires terrain support, but it is much easier to sweep with it than with Volc because:
A) Setting up terrain is easier than removing entry hazards and it isn't a momentum drain.
B) It can't be revenge killed by scarfers.
C) It has fewer counters than Volcarona (physically defensive Zapdos and Hippowdon, Koko is just a check).
D) It sets up on the most overused Pokemon in the tier.
It doesn't really make sense to me why is Hawlucha ranked lower than Volcarona when it is much more consistent at its job and is easier to fit on teams.
4. The popularity of rain teams is really annoying for Volcarona.
For these reasons I think Volcarona is currently the worst Pokemon in A+ and should drop.
I strongly disagree with this. Volcorona has a way to by pass each of it's defensive checks bar mantine. Volc gets Hp ground, can use Psy Z and with fiery dance it can put constant pressure on chansey until it can kill it. What I see is more of an argument that hawlucha should rise than an argument that volc can drop. I would also like to mention that it can only be revenged by faster Scarfers so due to it's speed tier of 100 it can tie with many of them or outspeed them. I would actully say volc may be a far bit better due to keldeo slowly meeting it's demise. It is also hard for some of the revenge killers to actully revenge kill volc as it lives a water shuriken due to the SPdef boost and I would not say that mega pinsir is a reason for it to drop as mega pinsir has always a threat towards volc since it's inception. Volc is a terrifying sweeper who can set up multiple times and I find that the defog support (which you should have anyways) is not that big of a deal for the terrifying monster it can be. As a special sweeper volc is the best of the best (bar magearna) and I think that A+ perfectly reflects that.