Are bronzor and bronzong made out of copper? AFAIK bronze rusts into a ruddy red/brown color, and copper rusts into the teal color we see on bronzor and bronzong.
Speaking as someone who has actually dug legit 3500-year-old bronze objects out of the dirt, no; corroded bronze is blue-green, much like copper. Largely because bronze is, y’know, 90% copper.
Pokémaniacal 