How can I defeat the last boss of Imphi, the king of ninety nine nights..

Hey, I know this is a bit late but it doesnt seem lots of people are playing this game even though it's very good and I only beat that boss a little while back, anyway, the easiest way is to train Inphy to level 9 and then use that move you get ( A-A-Y ) on him over and over again, the other way is if your on level 8 use the move, X-X-X-Y-Y-Y-X, on him, it's harder but still works. Good luck.

James Clemens Fan forgot to mention that you need to equip an item called... Er, what was it? Divine Ring I think. It's ability stops your block ability, but you don't lose red orbs when you do a 'Drains Orb Gauge' attack. The thing should have 4 abilities, including the no-block one.