After seeing a bunch of video's about hunters and deathknights soloing oonyxia, but no paladin to be found, I wanted to try beating her myself. Yesterday I managed to solokill Onyxia 10 man as a Paladin, it took me a few wipes, and 52 minutes to actually kill her, but here it is:

http://www.youtube.com/watch?v=EcljaeDxsFQ

On the lvl 60 onyxia, melee could still hit her when directly beneath her. How annoyed I was to find out that doesnt apply anymore...

In other words, the first and last phase were going to be a (long) stroll in the park. The challenge was to:
A) keep up with the Onyxia Lair Guards spawning
B) keep myself alive
C) drop 1.2 million of Onyxias health in the process, with ranged attacks >.<

I also found out that tanking so many whelps is devastating for your shield, so I brought a reserve shield, since my main shield broke down halfway on a try before.

Anyway, damage done to Onyxia comes from Avengers Shield, Judgement, Censure, Eye for an Eye, Holy Wrath and a few Exorcisms.

My gear is full 359 tanking gear (not the mix of dps and tanking gear my armory might show)
spec: http://www.wowhead.com/talent#sZhrhfRddR0ufbh:cVkmbMmcz
Used Str food, 300 Str flask, Drums of Forgotten Kings and the lvl 80 Runescroll of Fortitude