https://blog.faceutil.com/2017/05/05/gba-%ed%8f%ac%ec%bc%93-%eb%aa%ac%ec%8a%a4%ed%84%b0-%eb%a3%a8%eb%b9%84-pocket-monsters-ruby-%e3%83%9d%e3%82%b1%e3%83%83%e3%83%88%e3%83%a2%e3%83%b3%e3%82%b9%e3%82%bf-%e3%83%ab%e3%83%93/