Coolest/most interesting boss fight

Tie between OoT Ganon and TP Argorok

Ocarina of Time: Bongo Bongo
Majora's Mask: Twinmold and the Majora's Mask battle
Phantom Hourglass: Bellum
Twilight Princess: Zant

I pick Zant. I wasn't expecting the battle to change so much.

The Majora's Mask Boss Battle that was cool expecially with Fierce Deity Link and I like the Argarok boss battle in TP cool bosses I have more but there not as great as the ones I picked..

I would actually have to say either that Ganondorf fight in WW or the Ganondorf swordfight in TP, since, for a swordfighting game, they really don't have nearly as much swordfighting matches as I would like. Also, the fact that Ganondorf can so easily block most of Link's attacks really just goes to show that Link isn't really all THAT good in most of these games. Sure, in WW he has the Parry attack, and in TP he has the attacks he learns from the Hero's Shade, but that's about it. In TP, it even makes a point in making you use these techniques in the Ganondorf swordfight, since the back slice towards his non-sword arm has a better chance of hitting and you have to use a Mortal Draw and Ending Blow to kill him. Other than those exceptions, most Links have about as much skill as a random bloke being given a sword and told to swing. Where he really shines is with his abilities with pretty much every other weapon he gets a hold of! Though there really isn't much mastery in the Ball & Chain, as it's a rather straightforward weapon.

I had nightmares, it was so crazy!. Now I think Genie is cool.

OoT phantom Ganon is cool too.

The Phantom Ganon battle in Ocarina had an amazing atmosphere about it, the paintings, the blinding electrical attacks, that room and everything in it was a stunning slice of Zelda. Majora's Wrath was simply stunning, the most visually striking, most varied and spontaneous enemy on the Nintendo Sixtyfour. Only barely surpassed perhaps by Zant, in my opinion.

The entire final battle of Link's Awakwning inside the Egg. All five forms of the Nightmare and Dethl. Not one fight after of before has gone before that one.

Twinrova