Okay, so the last couple pages have been very... interesting. We brought back the Chansey vs. Blissey argument (guys, I honestly had déjà vu), thought about dropping Pokemon solely based on their BST, and talked about the validity of the C and D ranks. I'll try to respond, to the best of my ability, as well as highlight some Pokemon that should move.
The C rank is meant to be for Pokemon that can be used well, but require support far greater than Pokemon in above ranks. It doesn't mean it's a shitmon, or one that is only ever used by noobs. A Pokemon's SPL usage is helpful in determining how viable a Pokemon, but it isn't the end of the story. Infernape, for example, may have 0% usage in SPL, but it doesn't mean it doesn't warrant a ranking, an analysis, or a teamslot. Of course, the problems with using Infernape should always be noted, but, Infernape can be used well on a good team by a good player. The D rank represents Pokemon with either even less of a niche or that require even more support, but are still not deadweight. These Pokemon (Cs and Ds) can and will be used in a competitive setting. They generally perform worse than those in above ranks, but still deserve to have a ranking.
Okay, on to my thoughts on each rank/sub rank.
S Rank:
Aegislash
Charizard (Mega-X)
Deoxys-D
Deoxys-S
Landorus
Thundurus
• Everything is perfect here. Not much to say.
A Rank: Reserved for Pokemon who can sweep or wall significant portions of the metagame, but require some support or have some flaws that prevents them from doing this consistently. Supporting Pokemon in this rank may give opponents free turns or cannot create free turns easily themselves, but can still do their job most of the time
A+ Rank
Azumarill
Bisharp
Charizard (Mega-Y)
Clefable
Excadrill
Garchomp
Greninja
Gyarados (Mega)
Keldeo
Mawile (Mega)
Pinsir (Mega)
Scizor (Mega)
Talonflame
Tyranitar (Mega)
• Again, absolutely nothing I would change.
A Rank
Dragonite
Ferrothorn
Gengar
Heatran
Hippowdon
Kyurem-B
Landorus-T
Latios
Terrakion
Tyranitar
Venusaur (Mega)
• There's honestly nothing worth bringing up here.
A- Rank
Breloom
Chansey
Latias
Mamoswine
Manaphy
Mandibuzz
Rotom-W
Skarmory
Zapdos
• Breloom is good, and it has recently surged in popularity. However, I think A- is overselling it. It needs hazard control to work properly and is reliant on a weak STAB and an inconsistent STAB. Yes, BirdSpam has gone down a bit. But, Birds still slaughter Breloom, it still can't get past Mandibuzz and Venusaur, and it hates how Fiery the metagame has become. It's a super useful Mon, but it is reliant on its team to function more than other ranked Pokemon, and I feel like it fits in with the B+ ranked Pokemon better.
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 outperformed by a Pokemon in A or S Rank, but are otherwise very dangerous, may also fall into this category.
B+ Rank
Conkeldurr
Diggersby
Garchomp (Mega)
Gardevoir (Mega)
Gliscor
Gyarados
Kabutops
Manectric (Mega)
Medicham (Mega)
Politoed
Quagsire
Raikou
Scizor
Scolipede
Slowbro
• I believe Scolipede deserves A- rank. Its flaws are apparent, however, its Life Orb late game cleaner set is extremely good now. It beats Deoxys-S, who often ends sweeps prematurely. Its coverage allows it to beat many common threats in the metagame, and its poor special bulk is mitigated by its excellent speed and power. I won't even bring up Baton Pass.
B Rank
Amoonguss
Chesnaught
Gothitelle
Heracross (Mega)
Kingdra
Lucario
Mew
Suicune
Sylveon
Tornadus-T
• Everything here is ranked perfectly.
B- Rank
Absol (Mega)
Aerodactyl (Mega)
Alakazam (Mega)
Crawdaunt
Rhyperior
Staraptor
Thundurus-T
Victini
Volcarona
• Okay, two main things here. One: Staraptor is much more of a B ranked threat to me. Its band set is absurdly powerful, and is able to break walls so that Talonflame and/or Pinsir can clean. Its scarf set is still powerful, but instead allows it to revenge kill threats.
• The other change I'd make is dropping Thundurus-T to C+. It's powerful and fast, but it comes with such a huge loss of opportunity. Thundurus-I has much more utility for a team; it's unpredictable, it can end sweeps with priority Twave, kill Stall with Taunt, all while hitting hard with both of its offenses. Thundurus-T hits harder and has a good DoubleDance set. However, the opportunity lost is apparent, and certainly should be considered.
C Rank: Reserved for Pokemon who can be effective given the right support, but either have crippling flaws that prevent them from consistently executing their strategy or are completely eclipsed by a Pokemon in the above ranks.
C+ Rank
Aggron (Mega)
Alakazam
Ampharos (Mega)
Blastoise (Mega)
Celebi
Ditto
Entei
Espeon
Goodra
Haxorus
Hydreigon
Klefki
Krookodile
Kyurem
Rotom-H
Sableye
Sharpedo
Shuckle
Smeargle
Starmie
Togekiss
Weavile
Zygarde
Here's where things get really weird. The C ranks are divided very weirdly, and I'll
try to make sense of it.
• Mega Aggron deserves to go back to B- rank. It has little opportunity cost when used; it always pulls its weight. It hits incredibly hard and will not die to any physical attack. It's very useful for stopping basically every physical attacker in its tracks, all while crippling switch ins with Twave or damage. The lack of recovery sucks, but that's why it isn't A rank.
• Mega Ampharos deserves B- rank. This one I'm really adamant about. It has insane bulk and insane power, which both let it perform as a tank. It can be a pseudo cleric with Heal Bell, as well as a hard hitting bulky pivot with Volt Switch. Additionally, it can use agility, often on rain teams, to first outspeed Tornadus-T, and then sweep with its destructive, Modest STABs. Its typing gives it useful resistances as well as great STABs, and its only true flaw is the lack of recovery. However, it can use RestTalk superbly.
• Mega Blastoise deserves C rank. Yes, it defeats spinblockers. But, who actually uses them anymore? The two best spinblockers, Aegislash and Gengar, are both absolutely destroyed by the much superior spinner, Excadrill. Yes, the difference in typing is useful. However, taking your mega slot for a spinner usually isn't worth it, especially when some of the best Pokemon in the game that need hazard support, Pinsir and Charizard, cannot be used effectively with it.
• Celebi for C- rank. This is a case of a Pokemon that can't do what it wants to do effectively, but still is decent in and of itself. It passes Nasty Plots. Cool, right? Well, why wouldn't you use Venomoth, Gorebyss, or Smeargle to pass Shell Smashes or Quiver Dances? The extra speed is much more useful. Also, Celebi's typing is just so bad. Basically every Pokemon it wants to be able to wall, like Landorus, carries a utility move that hits it extremely hard: either Knock Off or Uturn. There honestly aren't many Pokemon that can't OHKO Celebi. Rain isn't prominent, and even if it were, it still would have a hard time. It isn't the level of D rank, but C rank is 100% overselling it.
• Goodra for C- rank. What exactly does it do? Okay, I won't be as critical of it as others have been, but still. It takes special hits well, falls to basically every physical hit, can't recover, and can only do a fair amount of damage. Sure, it isn't ever useless, but when does it ever do something notable?
• Hydreigon for C rank. It's nowhere near as bad as Goodra. It can accomplish things in battle. However, it's walled by every fairy in the game, is now considered fairly weak, is still very slow, and only has decent defenses. Is there a point to using it? Of course. However, it often finds itself in a position where something else would be preferable, and C+ is a rank where things are between the definitions of C and B, not completely at C.
• Krookodile back to B-. Its typing is extremely useful defensively. It hits hard for a defensive Pokemon, has utility in Taunt, Stealth Rock, Toxic, and Knock Off, and is an Intimidate user that can beat Bisharp. Its offensive sets are also very good, with Moxie being able to clean up late game. It's often compared to Landorus-T, but the better typing for an Intimidate user, as well as the absence of lost opportunity make up for it. The difference between A and B- is obviously still large - C+ is underselling Krook.
• Kyurem down to C rank. Can it do things? Yes. SubRoost is an annoying strategy that stalls out Pokemon quickly. It hits hard and has astounding bulk. However, the poor defensive typing and the mediocre speed, as well as the large opportunity lost makes it often not worth it, and thus deserving of C.
• Zygarde down to C rank. I'm not going to be one of those people who says it's outclassed by Garchomp - it isn't. Its main problem is the absence of an important niche. SubCoil is cool, however, it lacks immediate power and is easy to stop with its low speed and common weaknesses. It is outclassed by nothing, and isn't without a niche, but is still fairly mediocre.
C Rank
Abomasnow (Mega)
Banette (Mega)
Blissey
Chandelure
Crobat
Dugtrio
Escavalier
Gardevoir
Gastrodon
Gourgeist-Small
Gourgeist-XL
Houndoom (Mega)
Infernape
Magnezone
Moltres
Omastar
Porygon2
Reuniclus
Roserade
Salamence
Seismitoad
Snorlax
Tangrowth
Tornadus
Toxicroak
Umbreon
Vaporeon
Venomoth
Wobbuffet
• Chandelure to D rank. What are some reasons to use it? Anyone? Exactly. Its scarf set is very easily countered and checked, its specs set is incredibly slow, and its defensive set is honestly terrible. It isn't terrible, but its niche is so tiny that I can honestly never justify it on a team.
• Crobat to Unranked. It frankly doesn't do anything notable. It lacks power and defenses; all it has is speed. There are good defoggers in the metagame, and the bat unfortunately isn't one of them.
• Gardevoir to C+ rank. Call me crazy, but I've been using Scarf Gardevoir a lot lately, and it is very good. Its flaws are noticeable - it is fairly weak and has no physical defenses. However, it is THE ONLY fast fairy type, and thus is a great choice if your team needs a Pokemon to be able to revenge the musketeers. Trace is also a fantastic ability.
• Gourgeist-XL to D rank. It is a phenomenal counter to Diggersby and Excadrill, but other than that it doesn't do much. Its small forme is generally superior, as it has the speed necessary to be an effective Will-o-Wisp and Leech Seed user.
• I forget who mentioned it earlier, but I agree. Porygon2 deserves C+ rank. Its bulk is outstanding, it has a fair amount of power, and great utility in Twave and Foul Play. It can recover, which is amazing for a wall, has the always great ability Trace, and can set up Trick Room. It is hindered by Knock Off, but just look at Chansey! Porygon2 absolutely needs to move up.
• Snorlax for D rank. What exactly does it do? Okay, it has Blissey level special bulk, with a real offensive presence. It's less conventional than other special walls and tanks, and for a good reason; it has no recovery. There frankly is little reason to use Snorlax, and I find D rank to be much more appropriate.
• Tangrowth absolutely needs to go back to C+ rank, even B-. Its physical bulk is outstanding, and with an assault vest, its special bulk is so too. It has reliable recovery in the form of Regenerator, hits exceptionally hard with Leaf Storm, and has great coverage with its remaining moves. It is also able to cripple many Pokemon with Knock Off. It has a worse typing than Amoonguss, but has much more bulk and hits much harder. It is an exceptional offensive pivot, and C rank is not where it belongs.
• Toxicroak to unranked. It's far to passive to actual fit on rain teams, its supposed niche. Unlike other pokemon that belong in D rank, Toxicroak actually a) doesn't have to be ranked, and b) doesn't have a niche, at all.
C- Rank
Cresselia
Gorebyss
Hawlucha
Jirachi
Ludicolo
Slowking
Zoroark
• Hawlucha is frail, not powerful, and thus is walled by almost everything and OHKO'd by almost everything. I don't honestly see what's keeping it from D rank.
• Zoroark for unranked. It has a tiny tiny tiny niche, but its flaws are too much to warrant a ranking.
D Rank: Reserved for Pokemon who have a very small niche in the current OU metagame, and have very noticeable flaws that make them more trouble then their worth the majority of the time.
Cloyster
Cofagrigus
Empoleon
Exploud
Meloetta
Mr. Mime
This is fine, except for the grammar :P
Also, Froslass for whatever reason was removed from the list. It was always C- rank, and I think it fits in there perfectly. It still has an analysis, and I have no idea why it was removed. If it really needs discussion, fine, but I think the best decision would be to just put it back where it was.