Behold, the Gyro Ball formula.How does the Gyro Ball damage formula work exactly? I know it's 25*(Opponents Speed/Users Speed) but after you get the number that comes out of that, are you supposed to round it to a certain number like Grass knot? Also, is there a damage calculator that can do moves like Gyro ball and Grass knot?
Also, as far as I know, Metalkid's calculator is the only online calculator that allows you to input an actual move name; the others just ask for move power. Still, the calculator's damage calculation isn't 100% perfect (but usually close enough) and it CAN'T do the moves in question.
However, the calculator in my Resource can do those moves, though you'll have to use the actual Speed stat if it's modified in any way IIRC. It has to be downloaded, though, and is only available in Microsoft Excel. (I should get to making a version that works perfectly with OpenOffice...)