A ridiculously annoying thing for some competative players like me:
WHY DOES THE FLYING TYPE ONLY GET AIR SLASH AND HURRICANE AS SPECIAL STAB??????
No, seriously. Unless you are Yveltal or Lugia, that's all you have. Here's the complete list of special Flying-type moves (that are not signature moves):
Hurricane (110 BP, 70% Accuracy, may confuse)
Air Slash (75 BP, 95% Accuracy, may flinch)
Air Cutter (60 BP, 95% Accuracy, high crit hit ratio)
Hidden Power Flying (60 BP, 100% Accuracy)
Gust (40 BP, 100% Accuracy)
...what the hell.
The real outrage is that Air Slash still only have 95% accuracy.
So for special flying types, your options are Hurricane, which only have 70% accuracy (unless you are in the rain like Pelipper), or Air Slash, which only have 75 BP and still isn't perfectly accurate. And if you happen to not have either, you have to resort to Hidden Power Flying. A Pokemon forced to rely on Hidden Power as their STAB move. The only Pokemon that have to do that which I can name on the top of my head is Unown.
Oh, and outside of HP Flying, the strongest Flying-type move that have 100% accuracy is the almighty Gust. Pathetic.
Unfortunately, the Flying type is not the only type that have those woes. The best physical move Electric gets is Wild Charge, which gives recoil and have questionable distribution (in what universe does Snorlax Wild Charge?). Second place goes to Thunder Punch, with its sad 75 BP. Psychic have a grand total of 4 physical moves, the strongest of which is Psychic Fangs. Rock is even more pathetic, with only three special moves, with one of them, Meteor Beam, being almost useless as it needs a charge turn (not to mention the second strongest, Power Gem, have horrible distribution). And what about poor Steel? Sure, it is the best defensive type in the game, but it comes with horrible costs. Steel have only two special moves, which are Flash Cannon and Mirror Shot, both of which have average or below-average BP. Physically, it's not much better, with Iron Tail and Iron Head as its best options (although some Pokemon are able to make use of Heavy Slam and Gyro Ball). When you compare those to types like Fighting and Dragon, with a diverse amount of options for attacking, you know what is wrong.