True [50%]: Music,yes you're totally right,the ingame music shouldnt be changed unless the creator checks and thinks he would've put this music himself.
False [50%] : Character names,well yes you're kind of right there but also take in fact one thing...if he doesnt translate the names you'll end up in a phrase like "Juan Pablo has challenged you to a Battle" or "Guillermo selected Bulbasaur!" ,which would be the game too Hispanic...he's just trying to make it more English like " James has challenged you to a duel" or "George selected Bulbasaur" ,im spanish and i totally dont mind Portuguesse names,but some people actually want the game fully English-ed.
This made me laugh many laughs. Just know I have nothing against you, my dear. I was just trying to making a point.