Granblue Fantasy: Relink

As it is written in the description, this battle takes place at the very end of the 8th chapter, at the moment when you control Bahamut (not the tank at the beginning of the chapter, but the dragon). It is difficult to waste this moment, because the checkpoint is located in front of the boss, and Bahamut is its final part. The easiest option is to turn on the Story difficulty before the battle, then turn on Full Assist Mode in the Assist Mode Option menu, your character will fight on his own and, more importantly, dodge everything himself, you only need to guide him, Bahamut will also fight on his own. During the entire fight with the boss, the auto-dodge was 100%, and the damage never occurred. But for the trophy it is important not to take damage - precisely when you control Bahamut.

After completing the game, a choice of chapters and sub-chapters will be available, you can go back and finish it.