I've been using Crobat to great success this gen (bear in mind this is pre-Poke Bank)
Crobat @ Black Sludge
Jolly
Infiltrator
Brave Bird
Defog
Roost
Taunt
232 HP / 84 Attack /192 Speed
The EV's ensure maximum HP investment for Brave Bird while still retaining a Leftovers number and allowing Crobat to switch into Stealth Rock five times. The Speed outpaces + Speed Greninja by a single point (Jolteon/Aerodactyl/Weavile/Talonflame can all take on Crobat with priority or type-advantage) and the Attack EV's are basically there to give Brave Bird a bit more bite.
I love this set, since it functions as a great supporter to the team. Defog gets rid of pesky hazards and since Crobat is part Flying, it only needs to worry about Stealth Rock, which it can easily Roost off. Taunt is great as a lead which is what I normally do if the opponent has a Smeargle. Other options for Crobat that I have tried in the past are Haze and U-Turn, both of which are great to use, especially U-Turn if the opponent brings in something like a Tyranitar. You could even run Cross Poison if your Dragon's need the Fairy-Types to deal with it (darn 4MSS). Infiltrator is godly, I've seen far too many Scolipede run Baton Pass with Speed Boost and being able to KO the switch in behind a Substitute is nothing short of amazing.
What other partners are people running alongside Crobat? I'm currently using a Toxic Orb Breloom, who deals with Rotom-W, who is quite prevelant, as well as helping out against Crobat's worst enemies, Steel and Rock Type Pokemon.