Adolphin, be nice.. you weren't the smartest guy on this topic either. And now you are selling these mounts with this method which i can't understand why people are buying it since it's here open for everyone. But that's another story and does not belong in here..
Vaite, which mount do you mean? TLPD or Aeonaxx?
For TLPD you have to check all 4 routes, also the big one and of course for Vyragosa and yes, you should kill Vyragosa so a new dragon can spawn (TLPD or another Vyragosa). Waiting for the big route can consume a few noodle carts of yours^^
For Aoenaxx you may do sth wrong, because he is like always up... I never had a situation where Aeonaxx wasn't there and in 2 days of camping he had to be there at least once..