Things You'll Need
Instructions
Completely fill the Overdrive meters for Tidus, Rikku and Wakka before fighting Braska's Final Aeon. The method needed to fill the meter varies based on the current Overdrive mode for each character. You can check the Overdrive mode in the status menu.
Enter the boss fight with Tidus, Rikku and Wakka as your party members.
Use Rikku's Mix Overdrive to create "Trio of 9999." You need to select two Wings to Discovery as the items to add to the mixture. This causes all attacks made by your party to do 9,999 damage each.
Use Tidus' Slice &Dice Overdrive. This is slightly weaker than the Blitz Ace Overdrive, but it hits all enemies. This kills off both Yu Pagodas that are healing Braska's Final Aeon during the fight.
Use Wakka's Attack Reels Overdrive. The amount of damage this causes is variable, but Braska's Final Aeon should be almost dead after this is used.
Attack Braska's Final Aeon with normal attacks. It should only take a few more attacks to defeat him.