Yes. You are bang on. For me, if the pokemon are copies it is just not the same. I have a pre-owned platinum game full of hacked shiny's that I inherited from GAME. I am still working out what to do with it. It includes a 'Hall of origin Archeus' but its Hacked, for me its useless.
I understand the feeling, if I had to pick between not having a legend and having a hacked one I would much rather just go without...