Hi everyone! I'm new here and I want to share some info about Chesnaught, I don't know if this has been answered yet but I managed to breed my female Chespin with a male Torkoal with Shell Smash and the hatched Chespin didn't learned it. I didn't try breeding my female Chesnaught with Torkoal, but I don't think it can learn Shell Smash anyways. Hope this info can help here in someway.