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This can be cheating but I really want to go for Persona 5 OST. For boss battles there are: Life will Change, Blooming Villain, River in the Desert, and Yaldabaoth.
I've been playing Persona 5 recently so it seems I'm too obsessed with Persona now XD.
Some of my favorite boss battle themes as follows:
from Final Fantasy IV: Battle With the Four Fiends (the Archfiends' battle theme)
from Final Fantasy V: Clash on the Big Bridge (Gilgamesh's battle theme)
from Final Fantasy VI: Dancing Mad (Kefka's battle theme)
from Chrono Trigger: Decisive Battle with Magus (Magus' battle theme)
from Castlevania Dawn of Sorrow: Scarlet Battle Soul (Dario and Dimitrii's battle theme)
from Castlevania Portrait of Ruin: Esquisse of Violence (Brauner's battle theme)