Quote Originally Posted by Mo-Nercy
According to my sources, you can only implicate Rikku, Calli or the Chocobo Eater with the investigation to get Episode Complete.

Man, I didn't even know you can get Rin to be the culprit. Nice work. Oh and viewing the spheres as 1-3-2-5-4-5-2-1-4-2-1 will get Rikku to be the culprit (gets you the Ragnarok accessory)

It also seems that you don't need it for Episode Complete either. I think you're going to have to try again in New Game+

In my experience, quite a few key items are retained in New Game+, whether or not Gippal's Sphere is one of them is something I can't say for sure.

EDIT: Actually, I can say for sure. Gippal's Sphere does carry over to New Game+ Yay! But no matter what, you won't be able to get any more than 69 or the 72 Key Items. The one's that'll be missing are the Awesome Sphere (the one you give to either Yevon or the League), the Sphere Fragment (it's lost when you get Leblancs fragment and combine them) and a Calm Lands Pass (you can only have the Discount pass or the Free pass, but not both).
Yeah, and they reward that nice work by killing my shot at getting the Mascot dresssphere... *Smashes disc* (Ok, not really, but just typing that made me feel a little better).

Seriously, he's the hardest character to implicate, and you get a key item for it, but you can't get the Episode Complete? Stupid.

I was fairly sure Gippal's sphere didn't carry over, but I'll check again.