Originally posted by Akumaou812
But once you get on disc four you cannot get back on the ragnarok. What the hell are you talking about.
(SPOILER)You have to go through one of those 'portals' outside Ultimecia's castle - the one that leads to the great forest north of Esthar. Move through the forest 'till you find the Chocobos' "Holy Ground". Ride a Chocobo out of there and into the ocean. Stay in the shallows- you can't ride in deep water. Work your way south. It's not easy, but eventually you can get to the Centra continent. The Ragnarok is in the middle of the Kashkabald Desert.
Good luck!