This console application is to be used as a helper with the virtual console versions of Pokemon Red, Blue, Green, Yellow for Nintendo 3ds.
It helps determine which natures the Pokemon in the Generation 1 games will have, when transferred into Generation 7 games like Pokemon Sun, Pokemon Moon, Pokemon Ultra Sun, Pokemon Ultra Moon.
It is sufficient to run:
python naturecalc.py
or for Python 3:
python3 naturecalc.py