How do you see a hippowdon in Pokemon diamond without having to catch 1 or trade?
you catch all the unown and then go to the ruin maniacs cave or
you can beat the elite four and go to the resort arena and look
through the grass.
go to the elite four then get to the second of the elite four
(I've beaten them-and Cynthia shes easy) the elite four bertha
(second elite four) should have one but her first one is Quagsire
hope that helped if it didnt stuff you!!!!!!!