You can actually get a Tiara in Bevelle if you follow Baralai into the temple and talk to him once more. I don't think it gives any percentage though, and it's a trout accessory anyway, so whatever.

Squatter Monkey sidequest is literally holding the X button as you touch every pixel of the forest wall in the Kilika Forest. It's quite a silly quest. For the record, despite your passage being blocked at some points, you can still get all 13 monkeys in Chapter 1.

Do you know what's useful? Absorbing elements. Especially Lightning. Oh if only we had something to casually give a particular elemental absorption to whoever we want...

The status Yuna had there was Itchy, which blocks all commands except for spherechanging, and is immediatly cured by spherechanging as well. It's pretty annoying, but since spherechanging takes exactly 0 battle time it's not that bad.

Yay Fiend Arena

I love how the Flying Circus battle went perfectly well the moment you stepped up your game even just a tiny bit. The world of difference between pressing X to win and actually using strategies and having proper preparation is absolutely staggering in this game, I daresay more so here than in any other Final Fantasy game. Too bad the difficulty in this game is low enough the former is actually a workable approach -.-

The flans can be put to sleep but the Haizhe is immune. If you're redoing it offscreen, try Matador's Song. It basically makes you auto-dodge physical attacks which certainly would've helped here. Actually you're lucky you didn't run into an Amorphous Gel. There are tricks to take it out asap, but it's serious trouble if you're not careful.