User blog comment:Kogath/Monster Hunter 4 Ultimate for the Nintendo 3DS/@comment-5043481-20150220214520/@comment-4911512-20150220224429

from what ive been told and from what ive seen, it seems that each monster has a chance of dropping a quest for certain other monsters. I don't know the specifics, but I guess you gotta keep trying. cant say ive had better luck though xP.