So as I'm trying to find a suitable city for my character to have been raised in, I realize that I know so little about the Pokemon world. Oh lord.

I'm trying to think of a city that is really populated, somewhat polluted, and is centered around business. The closest I got was Castelia City in Unova, and I'll probably go with that unless anyone else has a suggestions for a better place? Ironically, the Pokemon my character owns come from Kalos, but all of those cities are more picturesque. I could modify one of them to better fit what I'm looking for, but I don't know if anyone is already doing anything with Kalos.