If you have the international version you will need to kill Dark Bahamut. Dark Aeons are very hard even when your party members are strong. Use Yojimbo's Zanmato attack (the powerful attack which instantly kills the enemy).
"Pee-yes", I forgot to say - after you go back to the room where Yunalesca was (once Dark Bahamut is dead) go down some steps, now have another look around the room and you should find a chest. Inside this chest is the Sun Crest.
Real love is feeling like being a part of that person's life almost isn't enough. It's more like a feeling that you would live in the same skin with them if you could and share every thought, heart beat, and emotion as one. - Rod Cannon
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