Smogon is where I read up on HP. Ive brosed their database for move set ideas as well, but not their forums. Ive got it on One at the momant, my electric dog, and its grass. Let those grounded little migits feel safe.
hidden has a damage depending on ivs too so even if you get hp ice on a pokemon that cant learn ice moves for example it may still only do a little dmg. check this http://www.smogon.com/dp/moves/hidden_power
Ill add it into my future workings. I tend to ignore the formulas. You seen the formula (the Real Math version) for hiddin power? I thought my eyes would bleed lol