Yeah, thats what i did. I qued into the story mode version once and cleared the fight. Then at 80 i formed groups with other people who wanted the mount via the party finder. Always tried to stay together at least 5-10 runs per group, and after a few nights of work i had my mount. Vyrerus is also right about the fight being soloable for some jobs at level 80. You need enough burst to drop the garula before rathalos torches the place, you need your dodges to be on point so you can use your potions just for unavoidable attacks, you need to be fairly fast/hard hitting to get through the down timer in a reasonable fashion, and you may need to die a few times for echo stacks. Or you could grab 1-3 friends(or strangers via party finder) and finish the fight in 3-4 minutes with much lower requirements(basically know somewhat how to play your class, be ok at dodging, be decently geared for level 80, and dont die a lot).