These are the top ten hardest boss battles, enjoy.
There is some spoilers here.
1 Ballos (Cave Story)
You have to get past the whole UNDERWORLD to get to him.
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Oh, and if you die on him, you go back to the start of the underworld! - EvilEpicNub
2 Tabuu (Super Smash Bros Brawl)
Why is Ganon from ocarina on here? Yes. he's challenging but he's hardly a candidate for hardest boss battles. This guy is the hardest because he can one shot you and dodging the off waves is hell. - HeavyDonkeyKong
3 Demise (Skyward Sword)
4 Monster X (Cave Story)
5 Majora's Mask, Incarnation, and Wraith (Majora's Mask)
6 Ganon (Ocarina of Time
7 Galactus (Marvel vs Capcom 3)
8 Nightmare (Kirby's Nightmare in Dreamland)
9 Seth (Super Street Fighter 4)
10 Dracula and Death (Castlevania Portrait of Ruin)
11 Ultra Marx Soul (Kirby Super Star)
12 Menace (Castlevania Dawn of Sorrow)
13 Sans (Undertale)
Sans or Sans the Skeleton is a character in the 2015 RPG Undertale created by Toby Fox. He is a lazy, pun-loving skeleton who is a supporting protagonist in the "pacifist" and "neutral" routes of Undertale, and a heroic antagonist/final boss of the "genocide" route. He is known for his incredibly difficult ...read more.
Sans is so hard to beat I died infinity times, still haven't beat him
14 Galacta Knight (Kirby)
15 Death (Castlevania)
16 Ornstein and Smough (Dark Souls)
17 The Masters (Mad World)
18 Vatii (Minish Cap)
19 King Bob-omb (Super Mario 64)
20 Holly Summers (No More Heroes)
21 Lenora (Pokemon)
22 Dr. Zomboss (Plants vs. Zombies 2: It's About Time)
23 Jergingha (Wonderful 101)
24 General Gaius (Dust: An Elysian Tail)
25 Lou (Guitar Hero 3)
26 Greevil (Pokemon XD: Gale of Darkness)
A way harder than ballos, evice and solaris!
27 Red (Pokemon HGSS)
Red is a Pokémon Trainer from Pallet Town, Kanto. He is the first character to be playable in the Pokémon series and his initial appearance is set in the Generation I main games. He has since then made various appearances in Pokémon media, including the Generation III remakes of Red, Green, Blue, ...read more.
28 Whitney (Pokemon Hgss)