http://www.1up.com/do/feature?cId=3173294
1up has just recently wrote an article on their favorite 25 boss battles. I haven't played most of the games they have on their, but I would like to express my opinion on those that I have played.
I'm not really sure if the battle with Jecht in X should be on there. It's been a while since I played the game for the first time and it's also probably because every time after my first playthrough I ridiculously power up everyone so Jecht seems pretty easy. I think the first time I played him he seemed pretty difficult, but the battle didn't really stand out for me.
I also think that Galaxy's final battle shouldn't be on there. It's too easy and it ended way too quickly for me. If they were going to pick a galaxy one or a mrio one I think it should be either that rock ghost from galaxy or the final boss from Yoshi's Island.
I do agree however with FFVIII's Ultimecia. It was a damn epic battle the first time I played it and it still is if you didn't over level your characters before you got to her.