NOTE: Haven't beat the game yet so I haven't gone through Larxene 2, Axel 2, and Marluxia and I still haven't played R/R.
Vexen 1 AND 2: GOD, you fight him two times IN A ROW.
The sword sleight: Sometimes my Glide broke in the 1st 2 hits. Sometimes I failed to Dodge Roll on the last hit.
Freeze: GOD, took me like 25 Freezes before I learned how to dodge roll it!
Ice blade: The easiest to dodge. :/
I will edit this when I beat Sora's story and R/R.