o crawdaunt isn't here
Nominating Crawdaunt for C+/B- Tier. Crawdaunt went from only usable with Tailwind Tornadus to a legit threat this gen with Aqua Jet + Adaptability and the Knock Off buff. All said, Crawdaunt is a total monster in terms of power. A simple CB set with Aqua Jet / Crab Hammer / Knock Off / filler totally crushes so many things to pieces. Priority is so prevalent and important in this metagame, and Crawdaunt's stands out as among the strongest. Knock Off is an absolutely excellent move, giving it a huge source of power. Crawdaunt is slow (though this is made up for by its priority somewhat) and pretty frail with some common weaknesses, but those don't stop it from punching massive holes in teams if played correctly. I lean toward C+ Tier in this nomination, but a case could be made for B- Tier. There's not really a whole lot else to say; Crawdaunt is powerful as all hell but has very significant shortcomings.
I absolutely agree with this. I don't actually use CB Crawdaunt, I just use a simple Life Orb set with Knock Off/Aqua Jet/Crabhammer/Swords Dance, and it rips holes in teams. I don't actually use Swords Dance for sweeping, it's pretty much just there to mess with Aegislash, because it seems to always like using King's Shield on Crawdaunt, and gets owned horribly when I use Swords Dance on the King's Shield. If Aegislash tries using King's Shield on Crawdaunt and mispredicts, it could end up getting its whole team counterswept.
This is just a short replay to show how well Crawdaunt can take advantage of Aegislash if you can scout it switching in:
http://replay.pokemonshowdown.com/ou-73371220
Another thing I really like about Crawdaunt is that it can actually OHKO Deoxys-D and bring Deoxys-S down to the sash for the Aqua Jet finish. That means they can only get one layer of hazards up max if both Crawdaunt and Deoxys-(D/S) lead. Yes, the Deoxys can just switch, but therein lies the dilemma when one faces Crawdaunt. If you switch, and you don't have a really bulky Dark resist, your switch-in is not only going to take a massive wallop from a LO-boosted Knock Off, but you're also gonna lose your item. And chances are, you'll be knocked into a good enough range for Aqua Jet to kill you off.
I admittedly had my doubts about using Crawdaunt at first, but after seeing just how hard he hits firsthand, I'm sold. Knock Off is just so deadly, and the only things that can switch in safely are really bulky mega-stone pokemon, because they won't get their item removed.
Admittedly, Crawdaunt is difficult to switch in directly, but having it come in on a revenge-kill or a wall can often cost the opponent a pokemon. At the very least, he has Aqua Jet to take out weakened faster pokemon, so he's not a sitting duck against any faster pokemon.
I agree with the C+/B- tier for Crawdaunt.