for me, i have two since one isn't considered a legit boss fight. the one that i've found the hardest was in a modded gh3 disk for wii with all the dlc, and the devil had surfing with the alien and those trills are impossible if he uses double notes on that, but once again, it was a hack so thats not a legit fight. i guess the hardest real boss is in ffx, that time you fight seymour at the top of the mountain, and doing that No Sphere Grid challenge.
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