I realized I never asked you how you are teaching Rapidash Megahorn. Rapidash can indeed learn Megahorn in Gen 6, from using the move relearner, as it learns it at level 1. That is what it appears to list on the French website. However, in Gen 6, Rapidash can not learn Megahorn from a TM, unlike Gen 7. (as also seen from the " Par CT/CS " part of the French website I believe, I apologize as I cannot read French)
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