Warmane vs Battle Pets.

If you have come to MoP for all the cool pets you can catch and prove your prowess against other players pets, then i am very sorry to inform you that you have chosen the wrong server. Most of the zones dont even have pets. You would be really wasting your time finding pets in the whole of outland.
Also the top rated pets on Warcraftpets.com,18/20 do not exist in this realm.

Blackwing Liar is bugged. so forget chrominius.
Anub Idol is either removed from loot table or has a very low drop rate.(i farm it every week on 16 characters).
Unborn Valkyrie Doesnt exist.
Xu-fen the tournament is bugged.
emerald prot whelp doesnt exist.
nexus whelpling doesnt exist.

the list goes on.

Blackwing Lair work its just the entrance is bugged and you have to relog while in group to get in.
Anub Idol is one of the hardest to get took me the longest to farm but it does drop.
Yea it does suck that most of the cooler pets don't exist.