1) The Final Battle against the Kefka Pallazzo (Final Fantasy VI)
God, after reuniting all of your allies that were dispersed around the globe because the bad guy won and more or less destroyed the world you invade his main base and then you have one of the best marathon bosses ever escalating a tower comprised of abominations inspired by the Divine Comedy and Dante journey trough Hell, Purgatory and Heaven.
And once you beat all that you then are confronted with the bad guy who basically became a mad god and he is chilling out atop heaven
2) Ashe meeting the Occuria (Final Fantasy XII)
During the middle point of the game your team decide to go and talk to a group of beings called Occuria who are basically the gods of this world and then after a lengthy and grueling dungeon you are treated with one of the most intense scenes in the series ever in which Ashe discovers that not only the Occuria have been manipulating humanity all this time but they are not as good or benevolent as they see themselves and are indeed very VERY disturbing even asking her to kill one of their own members who went rogue just because that one member decided to give mankind the ability to reign their own destiny.
Is one of my absolute favorite moments because the voice acting and writing is simply outstanding and I weep every time I think about this scene and how it compares to the next games in the series.
Just... just watch it. Is amazing and the part where they say "Venat is a heretic!!!" is jusT. Ugh.
3) The Falling of Cocoon (Final Fantasy XIII)
After beating the bad guy who was fused with the power source of Cocoon the whole thing is starting to fall down towards Pulse. The party are all trying to hold hands to stay together (while also becoming crystal because they completed their Focus) but Fang and Vanille decide to save them all by fusing and becoming the beast Ragnarok who jumps from the Floating Capital of Eden directly to the hell that is the lower half of Cocoon and then using lava and magic stop the fall by creating a massive pillar of crystal.
The whole thing is surreal and trippy and I love the final shot showing that the logo of the game was Cocoon embraced by Fang and Vanille.
The ending scene after that was also flawless giving complete closure to every character and it was so perfect that Square-Enix decided to make it trash retroactively when they decided to make sequels for the game.