save a Lichking/Yogg saron 10/25 normal progression on a toon.
make a lv1/lv55 new toon and lockstone the alt to ICC/ULD
get the lvl 1/55 into ICC and ULD
the alt is then saved to the progression.
find some random people to kill the boss with your level 1/55.
promise a bounty to whoever wins the roll of the mount if dropped, lets say 100k+.
If you get the mount, grats.
If you do not, cotinue the process with a new lvl 1 toon.
good mount hunting
Edit this can actually apply to elegon too, just harder to find a group, and higher price.