Myria’s theme from BoF3 is a really good evil song. Lufia 2’s sinistral theme, the music from the second form of Lavos, and the music while fighting Melfice from Grandia 2. Like Sinistral said the boss music for La Pucelle Tactics is good.
He needs to answer what kind of music he wants. Battle music, dark music, villain themes specifically, etc… There are different types of evil music one can go for.