FFX: Mega Strike Achievement
FFX: Mega Strike15
Deal 99999 damage with one attack
To do this amount of damage, you'll first need a weapon with the Break Damage Limit ability. Most of the Celestial Weapons have this skill (see "Weapon Master"). If you're maxing your stats by getting spheres from arena monsters, you'll likely have a huge strength stat on Wakka and some other characters, making this fairly simply, especially if you attack a weak creature who has had Armor Break applied to it. You'll most likely do this during many of the harder boss fights as well when you activate Overdrives and such.