I don't do many sidequests or fight the Weapons for this very reason. Either they're too annoying or time-consuming, or I just don't care about what they have to offer.

Out of the ones I've tried, FFX's lightning dodging was the most challenging. I also thought it was the most fun, though. The most annoying one is FFX's butterfly chasing game, because the red butterflies always seem to get in the way. Needless to say, I gave up on it after about 2 tries.