he isnt the last boss.... yes Yu Yevon IS but the guy who takes the form of ur aeons isnt... Yu Yevon made those fake aeons he isnt the fake aeon himself.

The last boss really disappointed me... unless u do 9999 per character, he would just heal 9999 HP and when one of ur character dies... everyone has Auto-life on because the "Fayth" gave them or something and never dies.... so the battle could go on forever the battle wasnt very fun... but the summoned beast battle was fun cuz i luv fighting just an aeon vs an aeon... sin(Tidus's dad, not the armor sin.) was really easy... cuz all u needed was Anima and Magus Sisters and attack away. He was really pathetic for a boss...