I was playing Colosseum today to try to train my Pokemon to level 100. I got bored of my Ampharos' moveset so I decided to replace Return with Hidden Power to see if I got lucky and got Ice. Strangely...I did. O_O Now, all I need to know is its base power. I tried attacking my Altaria with it...it did 178 damage (my Altaria having 157 special defense and my Ampharos having 196 special attack). From this information, could I figure out its base power (I do not get the formula at all >.<)?