Hey, I'm one of those horrid nerds that loves tabletop RPGs. Ha. I'm actually a Game Master, and I was wondering if anyone knows the internal workings of the game so that I may adopt a d20 version of Pokemon using the normal Pokemon archives of stats, because the horrible part of adapting your own Pokemon game is adapting all of the Pokemon into relevant stat constraints.
If you can't help, but know someone who may be able to, that's just as helpful. If I'm an idiot, and the rule system is posted somewhere already, notifying me is equally helpful.
Look at Metalkid's FAQ here. It includes a number of useful formulas for calculating stats. Unfortunately, it doesn't have damage calculations, however, there is a damage calculator on the site which you should be able to make use of.