It's a tie between three fights, but for now I'll say the five Judge Magisters in Final Fantasy XII IZJS, Trial Mode Stage 100.



This fight is just awesome. One of my favorite antagonist groups all bunched together, raised to superboss levels and actually using teamwork against you, with one of my favorite boss themes playing in the background. Playing for time doesn't work, random attacking doesn't work, you gotta hit them right where they're the weakest and make full use of all you have at your disposal. I loved that.

The other fights are Chac and Almighty Shinra with honorable mention to Major Numerus, all from X-2.