HELP HELP HELP!!!!!!!!!!!!!!!!!!!!

Ok this is what you need to do. Go to the place whre it is and hit is with a sonic boom bomb. It will shoot out of the ground and flail for alittle bit. Attack it now, then when it gets up, hit it with a paint ball so you know where it is. Repeat when it goes back underground (make sure you hit it with the sonic boom other wise you just wasted it). When it gets down to low health it will disappear and vanish. Now you have to go to it's nesting grounds, that is the very small area that is roughly in the middle of the map. Once you meet him there he probably won't retreat from that spot. Happy hunting.

Cephadrome, like most other wyverns will go to a specific area on each map to heal when they are low on health. When it is low on health you will see it's fin gradually lowering into the ground which indicates it's moving area. It sleeps in area 3 (small area above desert) and to get there easiest to go through base cape then area 1 (if you are in area 2) or through areas 10 and 4 (if you are in area 7) when you arrive you should see him sleeping. Aim for a good hit on a weak point to take full advantage of this and do a good amount of damage, a few more swings and he should die. If left alone he will sleep and heal until he had full health.

Hope this helps.

Use a paintball that shows you were it goes so you can follo it very easily

What I did is I brug alot of sonic bombs (just in case, they can be so annoying when they go back in the ground). The combo for sonic bombs is gun powder + screamer. Then I hit it with a paintball, followed it, and attacked. I would use aa sonic bomb whenever it goes back underground. This is why you hit it with a paintball so you are more likely to not waste a sonic bomb. When it is close to death, it will go back and sleep. It will be in the smaller dessert area (not like the 2 big ones). This is crucial that you get there FAST so it does not recover too much. It was pretty easy from there. Beware the Melynx and Apceros in the area.