all you have to do is learn the move surf and teach it to one of your pokemon. After that go to jubilife city and haed towards the poketech app shop but keep on going as far past it as you can and then you will see a boardwalk go out as far as you can on the boardwalk then use surf and once you're at canalave city go out past the gym and you will see a sailor he will say where do you want to head and you click on iron island and he will taken you to iron island
You find him on iron island in the cave
riolu
You find it in Orbegugh Mnes or on Iron Island
in Pokemon diamond and pearl, its in iron island
no but you get the riolu egg in iron island
cherrim you can find it by battling a certain Pokemon trainer on iron island
iron island
A Riolu egg can be obtained from Reiley within the Iron Island
YOu find Reilley at Iron Island. You go really deep.
Iron Island
iron island but have some Pokemon that have HMS
You can find a Shiny Stone at Route 228 and also at Iron Island