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Not quite. The romanization of 秘伝 is hiden, though coincidentally HM in Japanese also uses the same kanji. In any case, it's still HS (Herba Mystica) and HM (HM).
It was a good run, Pokemon, but your designs have mostly been absolute garbage since gen 7.
Regional variants started off as a nice concept but it just made them lazy with designs, to the point that they're not even trying anymore. "Just make a longer Diglett, they'll eat that crap up anyway."