The Ghost of the Divine Dragon in Legend of the Dragoon. Optional fight, I refuse to continue on with the game because I'm like that.
All the bosses of Chrono Cross were mainly easy (yet I loved the game)......still disappointed that Kid didn't have a Level 7 Element Special (or did she?)
On another note....Mike Tyson from MTPO (someone mentioned it earlier) wow, what a fight. Those one-hit wonds did a number on me.
Anyone remember Rad Racer for NES? The last level? Talk about a pain in the butt.