What do I do with my Hidden Powers?

I have a Hidden Power TM that I got from... some... person. It doesn't matter where I got it. I was thinking about using it on my Abra. I looked up on the bulbapedia how hidden power works, and got a butt-load of math that I don't wish to perform. Is there some simple lamens terms way to determine what pokemon (or when) I should use this TM on? If it matters I'm currently playing on Diamond.