Skeith gave me the most trouble the first time I've played the game, so Skeith gets the vote...Cubia was more of a nuisance because I didn't realize he changed defenses until 30 minutes in the fight (I don't think I've lost a fight to Cubia, yet). A close second would be Macha because of the charm attack she uses. That almost always screws me over...
my first time through the game: skeith, because i didnt know to data drain him so i fought for a LONG time, cubia was kinda hard the first time i went through as well but not unbeatable, the second time a came prepared....not even cubia can take 20 summoning spells
my vote: skeith i kept on dieing cause of his wand attacks
it could of been cubia too cause kpt on only attakin the main core and nothin else, the core kept on healing until i relize it was the dam repth core and i wasted a whole hour just to find that out
Skeith was probably one of the hardest bosses I've found so far in .Hack//. I lost to him five time and on my sixth try I was finally able to beat him.
Gorre. I could never tell the Physical defence from the Magical defence so I ended up dieing the first 14. The next 14 times I died was because Gorre did some rapid fire data drain. By the time the fight was over, the healing stuff began to take effect. too bad we were all dead
skeiths power may not be level 99 but is he considered lvl 99 cuz looking back on the previous phases most of them got easier the more i fought them, except for tarvos.
The first time that I played .hack Skeith was the hardest. Probably because I was a begginner and I had to train a lot to get to the right level. He was killing me with just one swipe of his wand. After buying 60 resurrects I finally beat him ( I gave my party members about 25 each).