Even though there are so many of these already online and easily used, I wanted to write my own because whenever my internet was out when I was younger, I would resort to playing Pokemon on my GameBoy or 3DS. For those that don't know, Pokemon has deep formulas built within the game that only get recognized by those who want to play competitively, so I needed a calculator to let me know if the Pokemon I just caught was worth training. The difference between the theorhetical worst Charizard vs the theorhetical best Charizard is roughly 15% difference between every stat. This means that if you had a poorly stated Charizard, it would take 3 attacks to kill something, whereas the better Charizard would 2 shot it.