I loved all the fights with Ghirahim, but round 3 was most definitely my favorite.
It was similar to the other two fights, but still unique and challenging in a different way. I felt so epic jumping down from the platform with a final blow. When he made that BIG ASS zweihander appear near the end of the fight, I nearly wet myself.
Others I enjoyed fighting were Koloktos (though not initially) and Scaldera. It took me forever to figure out you had to throw a bomb in Scaldera's mouth. I felt so stupid after, because it was an obvious reference to King Dodongo from
Oot!