The damage calculator must be off then, as it gave me the stated max damage... Or I forgot something. Will kook into it...Umm, Regigigas takes 54% min from Moltres's LO FB, so it's definitely not a counter. Moltres's FB followed by Kabutop's Stone Edge kills Regigigas, so it's not even a good check.
Edit: just checked using another calculator and got 270ish rather than 212... My bad, not going to use that calculator again...