Hardest Boss in gaming?

Second boss of Sonic Rivals 2. The first time I just won out of luck. The second time I figured out what was going on and lost.
 
elder princess shroob transformed.
 
Any boss that can 1 hit KO you and you'll be lucky if you get any damage on him.
 
Jigglypuff said:
Any boss that can 1 hit KO you and you'll be lucky if you get any damage on him.
Click to expand...
That describes the leveled up version of the Elite Four after you beat the main game, if you haven't reach lvl 100 yet.
 
MarioBros64 said:
The cloud guy in Paper Mario was had for me too.
Click to expand...

Oh yeah, I remember having trouble with him, as well. He's probably not the hardest boss I've done though, as I did beat him. I don't know, though. I didn't try very long on The Shadow Queen.
 
Jeff said:
MarioBros64 said:
The Master from Paper Mario in Toad Town Dojo
Click to expand...
The first and second time you fight him aren't very hard, the third time is harder, but he still isn't the hardest. To me, Anti Guy (if you try to fight him) is harder dispite the fact he's optional and he'll go away without a fight if you give him a certain kind of candy.
Click to expand...
This post just reminded me: the triple anti-guys in Bowser's Castle if you fail that doors quiz. 30 damage each turn. x_x
 
Fighter said:
This post just reminded me: the triple anti-guys in Bowser's Castle if you fail that doors quiz. 30 damage each turn. x_x
Click to expand...
I'm determined to beat that. There has to be a way....

Also, Infinity Mijinion in Mega Man X6 sucks. Every time you hit him, he multiplies and the screen becomes a giant clusterfuck.
 
Vile said:
Fighter said:
This post just reminded me: the triple anti-guys in Bowser's Castle if you fail that doors quiz. 30 damage each turn. x_x
Click to expand...
I'm determined to beat that. There has to be a way....
Click to expand...
Well, you could always fill your inventory with life shrooms and use a few HP up badges.