The Pokémon fandom is no stranger to wild predictions, and with a new generation getting started it's the season for just that. And the thing that surprises me every time is how radically different everyone's thoughts are, with many people saying they're "absolutely certain" things are going to go one way, and others are equally sure things will go the other. Enter the Fairy type. Making much fanfare pre-release as it turned out to trump two of the three best types in the game, and the other one being effective against it at the cost of pretty major nerfs elsewhere, the knowledge we gained about it over the course of the last camp separated players in two opposite camps.
One claims the Fairy type is dead on arrival due to the lack of strong representatives. And while I don't approve of that school of thought (I'll get to why in a moment), I can see why one would think that. Looking at the current roster, there isn't a single OU on there. That's right, the highest-ranked confirmed retcon is Togekiss (what a surprise) at #63. And as far as new Pokémon go... well, aside from obvious uber Xerneas, the one that's the most likely to do any damage is, hilariously, Klefki (depending on its egg moves, it goes without saying). Aromatisse and Slurpuff's stats are beyond crap and were given abilities that are exclusively for doubles and triples, and Florges also suffers from the latter, despite being this generation's Arcanine/Volcarona in terms of stats (the farcical movepool and mysterious lack of a Grass type don't help much either). Then there's the fact that many popular retcon picks, such as Chansey/Blissey, just plain didn't happen.
Still, that's jumping the gun a bit. The prime argument I'm going to use there is the fact that gen 5 OU was based entirely around weather. That won't hold true anymore, now that weather can only last 8 turns at most, and even that requires a big opportunity cost. As a result, a large chunk of the gen 5 OU tier - inducers, abusers and counters - will suddenly have a sharp decrease in usefulness. And who should be in a prime spot to take advantage of this but the Pokémon that found a home in UU and thrived in its weather-free environment, such as Togekiss and Azumarill.
We also can't neglect the fact that the Fairy type will radically change the way these Pokémon are played, defensively and offensively. I just mentioned Togekiss and Azumarill... they finally gained the secondary STAB they always dreamed of, and in the latter's case it can finally run Aqua Jet and Belly Drum together. They will also get extra opportunities defensively, with the immunity to Dragon and resistances to Fighting, Dark and Bug. Unfortunately, Togekiss does NOT get Moonblast, even via egg move. That shit would've been terrifying, to tell you the truth. 95 power, and 60% chance to lower special attack with Serene Grace? Sadly, it'll have to settle for Dazzling Gleam, but c'est la vie. We may also be able to count on Mega Mawile to invite itself to the party, depending on how much the one-per-team rule will screw it over, with terrors like Gengar, Blaziken and Lucario running around.
All in all, it's impossible to predict how big an improvement the addition of the Fairy type will be on these Pokémon, but just the fact that it will set them apart from their competition in the hunt for a team slot will be a huge boon. Heck, we may see the return of Pokémon like Whimsicott and Gardevoir (too bad about Pixilate being worthless on Mega Gardevoir, though).
But wait, there's more! We still have 120 or so Pokémon that aren't obtainable through any means in X and Y, and among them no less than 43 legendaries. And this is where things could get really interesting for the Fairy type. The pixie trio and Cresselia will almost certainly see it added to their typing, which could easily give them a second wind after suffering at the hands of Alakazam and Reuniclus in gen 5. Furthermore, many event Pokémon could also get the same treatment... for better or for worse. While Pokémon like Mew, Manaphy and Victini may enjoy that change, Celebi and Jirachi are praying so hard right now that their exceptionally synergetic typings remain intact. Even so, any of them would be a great addition to the Fairy roster, which would help cement the type's place in the metagame.
So that's it for the doomsayers. On the other end, you have those who claim Fairy is simply too good. Their logic: they're strong against the two best offensive types, and weak to two nearly unused ones, meaning Fairies will be able to just rain destruction freely. That one's way easier to reply to: if Fairies start overpowering everything (which I don't think is that likely, honestly), more stuff will start packing Poison and Steel moves just to beat them... and there's no shortage of Pokémon that can learn Iron Head or Sludge Bomb, let me tell you that. That was the entire point of the Fairy type to start with: make Steel and Poison more worthwhile offensively by having them be the only foils to a type that (theoretically) counters the best ones. It's a lot like going from rock-paper-scissors to rock-paper-scissors-lizard-Spock. Sure, Spock may look impressive because he beats rock AND scissors, two of the three that were there before, but then he loses to paper and lizard, and he doesn't look so hot now.
Wow, that went on way longer than it had any right to. So, what future can we expect for the Fairy type (at least until gen 7 shakes everything up again)?
Edit: Copypasta from the comments (because if there's one thing I learned from my time as an LPer, it's that no one ever reads them):
Nope. There's 2 ways to check out typings as of now:
1. Battle Maison. I believe Cresselia shows up there, for example
Asking for things on the GTS. While types wont show up in-game, they DO
show up (like an hour later, sometimes more) on your Global Link
profile's GTS tracker.
Anyway the point is: None of these are
fairy type. I've personally checked out Phione, Manaphy & Mew and I
am pretty certain that the pixies are pure psychic as well.
So basically, Gamefreak are complete idiots. Not touching them just because they're legendary? If you're going to make a new type, at least go all the way with it. I mean, this makes Fairy the least populated type despite all the retcons that DID happen.