The ever cheesy, but fruitful

MEGA AEON OWNAGE OVERDRIVE MEGA UNLEASH KAWAII UBAR NUBAR WINNAR OWNAGE TACTIC OF X BUTTON AND KILLS OF THE LEETHAX MEGA OWNAGE SYSTEM SUMMONABLE MONSTER PARTY KILLER BOSS MASTER WINNER

Also known as "Aeon Overdrives."

In this system, we find as many rich celebrities as possible and brainwash them, and force them to marry women twenty years younger than them. Afterwards, we teach them lies spewed by failed abortion victims who are mentally defected and horribly incorrect. Afterwards, we should get our followers to leave their jobs and act like complete hypocrites. Even further than that, we should farm 3800 for a Sacred Relic, and a further 1400 for the Radiance upgrade, and have an Immolation Aura that deals 40 damage per second. After that, we can own everyone!

However, as you have not reach my level of leetness, you may simply charge all of your Aeonss Overdrives to full, and systematically unleash them on the enemy (Seymour) until completion. If you fail, fear not, the Save point is just a few second away.

Alternatively, you can find the ingredients required to create a Trio of 9999 or a Quartet of 9 from Rikku's Mix Overdrive (I don't know what those are). Every attack dealt will henceforth do 9999 in that battle after used. But both tactics are equally cheesy, and you should probably just try to level up around the Save Point.