Best Final Bosses of all time

[Wisemon]

I'm going to give you the all Genesis version.

Kingpin in Spider-Man
The first Spider-Man game, circa 1990. I can't beat him without using a cheat code.

Carnage in Maxium Carnage.
You really have to tag out often between Spider-Man and Venom to get the best of him.

Fitzroy in Wolverine: Adamantium Rage.
He's so tough I can't beat him. At best, I've gotten him down to 5% health, but he always manages to win.

Cyclopsis in Mighty Morphin Power Rangers.
On the hardest combat level, I can beat him as Dragonzord, but I still can't beat him as the Megazord. You really have to time your attacks right.

Janna in Ghostbusters.
You really need all three lives, not to mention a Peking duck, if you want to stand a chance. She throws a mean spinning knife, and she never stops closing in on you.

It's so hard to choose one Robotnik, but I would say the last boss in Sonic 3. You get hit once, and you can't collect your loose ring before it falls from the sky. That makes the battle pretty tough, but nothing I can't handle.