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yep , the only things that can one HIT KO ferrothorn is a fire blast / heat wave / Flamethrower ect... and maybe a close combat from a STAB pokemon / +atk from status but becarfull due to iron barbs and rocky helmet 4-7 hit will kill you.
Battle wins and he said he is him and he had proof because in national championship he showed his user character and name It was same ...He said he wouldn't show his pacifist due to privacy....