Hardest boss battle ever?

I forgot the Resident Evil 4 Knife Fight between Leon and Krauser. It was really damn annoying if you missed any of the action triggers. Really fast too. =P

 

**** Im having a hard time beating Genesis Avatar in final fantasy 7 crisis core I gotta get my level up or something becuase I keep getting owned

 

Dang that thing is hard! I still can't beat it!

 

Either the final boss in Gun, or Gary from the original Pokemon Red & Blue.

 

kingdom hearts boss were hard windwaker was hard t, but i dont really know becasue that was a long time ago ; P

 

yea and you have to throw the barrals in his mouth gaw that was hard

 

Yggdrasil from Tales of Symphonia. I Was inches away from punching a baby because of how impossible it was. It was like breaking apart the Washington Monument with only a toothpick and dental floss.

 

Omega Mk. XII in FFXII is Pretty hard to beat. It has 1,000,000 HP and could easily kill a lvl 99 Character.

 

Pre-nerf Pandemonium Warden in FXI

New Final Fantasy XI boss could take 24 hours to kill