the boss you put down must have a reson, there is a play before put rule and all the nomal rules apply.
the hardest i have faced was tabuu from ssbbawl because he can ko your wrole party and is hard to defeat. i was on nomal differcuite sorry about my spellings
I would say Rev from Sonny in the bonus (Tick Tock was sooooooo much worse in the first one) I would say Bad Girl in No More Heroes .She can do with a baseball bat what the 8 greatest assasins couldn't do with giant swords, rockets, motorcycles, grenades, landmines, super powered explosions, katanas and giant magic cannons. She killed Travis Touchdown. Well she killed me playing as Travis Touchdown. Despite those two I think I would have to say............Everybody. Just go play legendary souls on Soul Caliber 5. I got beat by Kilik 12 times. Then my brother took over and wasted him with Mitsarugi. I look ahead of me "Oh hello Nightmare." I look behind me. "Thanks Satan!" Oh and geuss who's next Cervantes Freaking Cervantes! You ever fight Cervantes on very hard? Try it on Legendary.
Mega man battle network 6's real bass *the underground area* was the hardest for me took me 5-6 tries* he moves so fast when you get his hp low* and can kill you in 2-3 hit's