Lightning dodge is the hardest i.m.o., Chocobo race 00:00:00... Well, you get used to control your chocobo well after the first 10-12 races, after it, it's just pure luck. After 22 races, I get the Sun Sigil. I was wondering that am I be able to make this time again...? after 50 more races, the answer is no Luck.
Butterfly catch can be annoying at some points (if I remember well, there's a ridiculous loop somewhere, OMG.), but the BGM which plays under the challenge, is my favourite from FFX, (after the Ending of course) so that little thing helped me stay calm =). After some tries, butterfly catching is become a memory game, from the hardest ones.
The lightning dodge is the only thing that I missed. Everybody has the ultimate weapon, except Lulu. My record was ~173 or something like that, when I screwed it up because my eyes was a bit tired. I don't care about this thing anymore.