Ummm I found Lulus lightning dodgeing the hardest. But like I eventually got it but lost so many times. I went over 200 thats for sure. Also Aurons was pretty hard to get aswell. The others were kinda easy. But Lulus was hell to get. When I kept getting hit I kept trying and eventually got it.

That would be uber cool. Pressing X the whole time might also do the trick, although that would make my thumb sore. 
...seriously though, dodging lightning sucked.
Maybe I'll attempt Kimahri's and Lulu's... but probably not. I hope to get Wakka's sometime this week, I have Attack Reels now and have to work on getting Status Reels. I'd love to have Tidus's, and I have the weapon and Sun Crest even, but the stupid racing... I seriously want them all
and you have to trek all the way back round to go again, and it took me a couple of attempts after that. I literally let go of the control as soon as I touched the last butterfly. pfffff