I'd probably have to say Virgil from DMC3 " I think the toughest mode I beat him on was the one just before Dante must die. Truly an epic battle.
a close second would be...
Abysson from Tales of Synthonia, he's one of the optional bosses and he's a flippin bastard to fight "look him up on youtube!" I give him second cause fighting him is a little more frustrating then epic "though still epic"
easiest is probably Guilty Sparks from halo 3. Loved the game, and the ending still had a lot going for it. But he was pretty much a throw away.
a close second would be...
Abysson from Tales of Synthonia, he's one of the optional bosses and he's a flippin bastard to fight "look him up on youtube!" I give him second cause fighting him is a little more frustrating then epic "though still epic"
easiest is probably Guilty Sparks from halo 3. Loved the game, and the ending still had a lot going for it. But he was pretty much a throw away.