It doesn't work, I already tried it
Jeff, I would love to help you, but you really need to tell me more about the problem. Please send me a screenshot of the exact error screen and describe exactly what happens. I released this game over two years ago and no one has had a problem like this, so it is really very difficult to diagnose it if you don't give me information. Thank you.
Dear Jeff,
As I told you before, your problem is because you do not have the right alphabet/keyboard installed in your PC (your PC doesn't like the accent in Pokémon, basically).
Download this and put it in the BGM folder: https://www.deviantart.com/stash/01v275dfoqwv
Make sure the name of the file is: 'Pokémon Sword & Shield - Gym Leader Battle Music (Full)' You might need to rename it if you computer doesn't download the file correctly. Some PC keyboards don't have the é in Pokemon, which is what causes that error, so double check that e.
You may need to paste in the renamed file to replace the original one before you start a new game for it to work.