Question

Is Perish Song a move worth learning?

Answer 1

yes for Pokemon like mega gengar, which is arguably the best user of persish song. It can trap whatever it wants, and effectively kill with with perish song+sub+protect. Go ahead and try it out. It also messes up baton pass teams.

Answer 2

Well it depends on the situation. If I were to teach a Pokémon perish song, there would have to be no other good moves worth using. Plus in battle I wouldn't use it if you didn't have an extra to switch out to. Really it all depends on the Pokémon, the move set and the situation. If you gave me more specifics, then I could give you a more accurate answer.