User blog comment:AlisaChan/Hardest Final Boss?/@comment-5299815-20120828004312

They're not final bosses, but you can only beat them after the end of the game. There are plenty is find hard, though I feel like only mentioning those from FF series. XD

The 5 Judges at the last stage of Trial Mode in FFXII, Penance and Nemesis from FFX amd Shinryu from FFV.