Generally it is Japanese games that get the hard final bosses. RPGs are a notable exception to that rule, since the hardest boss in those games is usually an extra rather than the final plot-based battle, like Dullahan in
Golden Sun, or Sephiroth in
Kingdom Hearts.
Capcom games are really the hardest among modern commercial release games.
Devil May Cry 4's Hell or Hell Mode comes into mind (no, not Heaven or Hell, this is a ridiculous extra mode on top of that one) though there are legions of people who've beaten it. The final boss for Nero is something you could do without getting hit with practice, so it's more Dante's final boss, a whole mission you spend cutting up bits of the boss, that's harder (because there are other enemies involved, and the whole stage can get beaten away, killing you in HoH).
The Tyrant in
Resident Evil Remake while playing as Jill was absurdly hard as well, particularly when he realises that he can SPRINT at you with a GIANT CLAW while being a good seven feet tall and therefore really fast, forcing you to wrestle with the really slow running and bad controls of your character and try to dodge at the last second.
Dr. Love said:
Exactly it was pretty much impossible to beat Virgil on DMD mode without using the beowulf's.
Not true, Beowulf is unnecessary. Try using the Royal Guard style well. Build up enough energy in that, and you can pretty much one-hit Vergil with the counter move. I've seen it done. Another good weapon is Cerberus; the rolling sideways attack is very hard for Vergil to dodge once he's reeling from any first attack.