so it's all about luck here, ya?

I've beaten it using Anima's pain, it does a 650,000+ damage, then with a whip of Tidus's Caladbold, he is gone for good. My Tidus is at 140+ str and can still do a 90,000+ damage on Dark Valefor.

I've tried the save-and-load trick on Dark Yojimbo, but the problem is I CAN EVEN BEAT HIM IN THE 1ST PLACE! I need to level up, currently i'm hunting down ALL the fiends in SPira in order to complete the Monster Arena. I've captured ALL the fiends but haven't got 10 of each fiends.

Damn so i need to level up all of my character b4 customizing the SPhere Grid, ya?