Deadwilson
Veteran
I've yet to find a rare that can't be kited outside of the phasing by a level 50 friend/alt account. The most difficult right now is probably Lord Korinak because he spawns on a terrace, and you have to kite him up the cliff to Nagrand. I heroic leapt my way up on a warr but a DH would also work fine. Council is also iffy because it's a trio.
I've been doing it on a level 50 tank spec- all you need to do is taunt them on CD and they won't reset. I imagine any ability that reengages them without killing them would work. The lone exception I've found is Matron of Sin who teleports you regularly, and will occasionally reset when you're teleported. She's still doable, it just took several tries, and would probably be easier with a second tank.
I've been doing it on a level 50 tank spec- all you need to do is taunt them on CD and they won't reset. I imagine any ability that reengages them without killing them would work. The lone exception I've found is Matron of Sin who teleports you regularly, and will occasionally reset when you're teleported. She's still doable, it just took several tries, and would probably be easier with a second tank.