Can you get head smash on aggron without transferring one in in swsh?

Question

I don’t know if the egg moves part for aggron is fully known and wrote down so I need to know

Answer 1

Yes!
You can raise a Tyrantrum to Lv 66 and let it learn head smash. You can then breed it with a Pokemon from the Aron line and you get an Aron with head smash. You can raise this to become a aggron with head smash.
Source:Aron page and Aron egg move page