He's a hidden boss in the PAL version... I don't know anything about him except that you have to beat the Dark Aeons to fight him. Ask someone who's got that version to check it out.
If you have the PAL version kill ALL the Dark Aeons then he will appear as an airship destination.Good luck.He's an awfully strong s.o.a.b and requires special tactics to beat.And maxed out chars,custom armors etc...If i can recall,it was an hour long fight.12 million HP when you must constantly take out his arms which regenerate and have around 500.000 hp each is no joke.Yeouch