I managed to get Pogeyan after seeing him dead once and having a nelf hunter tame him a second before I got to his spawn point.
Then went after Olm the Wise and tamed him, tho I released him a few days later because he didn't really feel right for me.
Then yesterday, though it is not rare but still bloody hard to get, I tried to get the flamey pig. I sat there for 2 frustrating hours trying to get him before I gave up.
After wasting my time on that, I was really mad and needed to kill something. So I switched to my BM spec and put on my pvp gear and decided to kill alliance. Trouble was that my two spirit beasts I have weren't lvl 85 yet and I knew they wouldn't do as much dmg. I went to Twilight Highlands to look for Karoma, but couldn't find it.
Now, I've never liked the spirit crab, mostly because I don't like crabs too much and partly because everyone I've seen with a spirit crab gave it a stupid name (ie: LolCrabs, ItchyNuts, etc), but I decided to take a look for him anyways while I waited in the BG queue. After 10 minutes of looking, I decided to give up and level one of my other spirit beasts when npcscan went off and right next to the dying octopus/crustacean thing was Ghostcrawler scuttling around. I swiftly dismissed my previous pet, got ready to hit my tame button when.... *poof*.... Ghostcrawler was gone. Me being a noob and not reading up on him, I started to panic and swam around his whole spawn area, frantically spamming my npcscan button and after 4 minutes, I finally found him again and tamed him.
His name is Kaldurahm "Kaldur", he's named after Aquaman's apprentice, Aqualad.
