The first and third themes of the pacifist route final boss, "Hopes and Dreams" and "SAVE the World," prominently include Flowey's theme, "Your Best Friend"1. In the final phase, as you touch Asriel's soul and he regains his emotions and himself, Flowey's theme goes away and the music switches to "His Theme," which the title basically asserts is Asriel's true theme. The music box version "Memory" playing in the cutscene right after reinforces this. The neutral route final boss theme "Finale" includes both Flowey's and Asriel's motives in the same song, which is sly as hell. 1: In both songs, "Your Best Friend" is also set as a countermelody to the main theme seen in "Once Upon a Time" et al., which is possibly worth commenting on in its own right.