My favorite pokemon ever, Kingdra, looks like it's getting an analysis and hasn't been discussed, so I'll go ahead:)
"B Rank: Reserved for Pokemon who cannot sweep through or wall significant portions of the metagame, but can properly fulfill a given offensive/defensive niche. Support Pokemon in this category have flaws that prevent them from doing their job or are setup bait for dangerous sweepers. Pokemon who are partially outclassed by a Pokemon in A or S Rank, but are otherwise very dangerous, may also fall into this category."
This I think sums up Kingdra nicely. It has 3 usable sets:
- Critdra, which uses Focus Energy and Scope Lens to get a 100% crit ratio, which then works with Sniper for massive damage. As a nice bonus, Draco Meteor's Sp.Atk drops don't matter anymore, and you can fire them off over and over again. Dangerous for anyone slower than fully invested 95 speed..
- Rain Dance, which with swift swim basically acts as agility and a +1 to your water moves. You can run rain dance yourself or use a Politoed..
- DD/Waterfall/Outrage/filler, where the filler can be sub, disable, even iron head (for fairies). Typically outclassed by other physical DDers, but if you're expecting one of the other sets this could ruin your day. It also doesn't need to run coverage to beat Heatran, which is something most dragon dancers would die for.
No matter which set it runs, certain pokemon make for excellent switch ins, such as Azumarill and Ferrothorn. However, it fulfills an offensive niche with the above sets, and while it is partially outclassed by other dragons with higher stats and fire moves, it is dangerous if it is allowed 1 free turn. Kingdra should be B/B- Rank.
I agree with its viability, but I'd like to point out that water/dragon is fantastic typing both offensively and defensively. Offensively, its almost as good as fire/dragon with only 4 pokemon resisting both (of which, only Azumarill and Ferrothorn are common in OU). Defensively, only dragon and fairy hit it for SE damage, and so there's not too terribly many things that KO it through its acceptable bulk of 75/95/95. This adds up to a great pokemon that can pretty consistently get a turn to set up, and can cause pretty impressive damage to a lot of the tier. The general increase in bulkiness of the metagame hurt it, but it's new scope lens set really makes up for it, as even ferrothorn is 2HKO'd by 100% crit draco meteors. For this reason, I'd say
B or even
B+ as you'd be hard pressed to choose it over something like Keldeo or Gyarados, and it has trouble against specific walls, but it can consistently fulfill the role you assign to it and easily give you momentum for the rest of your team
You were right, I didn't investigate how those pokemon actually perform against Keldeo, because I didn't know how in the actual world, stealth rock was a given. Let me tell you how my match ups with Keldeo usually go down.
Dragonite*: switches in on either STAB, roost stalls until there's a miss (or I restore Multiscale), dragon dances, repeats. Usually Keldeo ends up switching out. Since Dragonite got free set up it usually KOs the next poke and they bring Keldeo back in to KO with Icy Wind, but this time, I outspeed and usually OHKO.
Azumarill: Switches in on anything, taking at most 46.7%, takes another, leaving it with around 20% left, OHKO's with Play Rough. That's the worst case scenario.
Slowbro: I've only ever run AV sets, which makes Keldeo's strongest attack a 4HKO
Mega Venusaur: Forces Keldeo out every time
Tangrowth*: Switches in on either Hydro Pump or Sacred Sword. 2HKO's with giga drain while restoring its health to avoid the KO (This is with the physically defensive AV set, never tested any other)
Toxicroak: Actually, I agree with you on this one. Only added it because someone asked me to. I guess they're using it in OU, but I don't think that's the norm.
Celebi*: Switches in on either STAB, Giga Drains til it wins.
Trevenant: switches in on either STAB (nobody's been dumb enough to get locked into sacred sword with a ghost type left yet though), and Horn Leech til it wins
Jellicent: Keldeo switches out
Tentacruel: SR usually is up for this one, hence the need for Tentacruel. I switch in, Knock off (prolongs to 4HKO), rapid spin, and if I'm still around I lay down a hazard. You're right though that he doesn't do much to damage Keldeo, but it is free support, so its gotta count for something.
Sylveon: I ran specially defensive, which can switch in, take 2 hits, and KO with hyper voice pretty consistently
*vulnerable to predicted icy winds, but since Keldeo is usually brought in to remove a specific threat, it rarely predicts the switch like that. If you're playing against a very skilled opponent, the starred checks are less viable
Obviously, things like crits and misses occur, but these examples show how I've usually dealt with Keldeo. If I didn't have 1 of these, I usually either baited the Hydro Pump and relied on a bulky water to fight it, but that didn't always work out as cleanly.
None of these pokemon is in the top 10 for usage stats as of December, but between them, you'll find at least 1 on a lot of teams.
Keldeo earned its
A rank because of how good it does its job, but without support, there's plenty instances where it can be rendered ineffective. With all the defogs and rapid spins running around, its really hard to assume it'll get SR support. Rain support's even less realistic as Politoed would rather just keep the rain to itself for its own wall breaking, and rain dance isn't exactly easy to set up without giving up momentum. Keldeo is great for eliminating a troublesome wall that would otherwise stop you cold, but it can't just blow up whatever it wants. Between priority, hazards, pokes that outspeed it, pokes that aren't OHKO'd, that 20% chance to miss, and Arceus knows what else, it'll take a lot of damage doing its job, so you can't expect it to perform past its assigned niche. For that reason, I do not believe it is deserving of A+. None of his other sets really reach A+ either as there are better calm mind sweepers, and his life orb / e belt sets directly contend with Greninja, who is arguably better thanks to protean, yet is only A itself (I say "only A" as if its a bad thing, being A shows how great it is, but also how it can't take on the world and win)