I no longer have Return Spheres, so there goes that.
I finally beat one! I traveled a bit before rushing back and barely saved in time; about as soon as I could turn around after saving, it came. Yuna was able to survive long enough to get some Summons with over-drives out, and then I finished him with Wakka's Elemental Reels (fire). Whew.
Still not a fan!
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http://img812.imageshack.us/img812/3492/eponaharr.jpg
Nominate E P O N A.