Go to jubilife city, then use surf on Route 218, Until reaching left piece of land, then go to the gate, then you'll be in Canalave city, Next and finally Go to the sailors house on the left side of the drawbridge.
You got to go to iron island and at the end of it you find it
The Pokémon you can get in Iron Island in Pokémon Diamond are Geodude, Graveler, Zubat, Golbat, Onix and Steelix.
iron island
You get it from a person at Iron Island.
Iron Island
There is one on Iron Island.
Iron island and full moon island?
so if you want to go to iron island you have to go to canalave city and find the dock where the boat is. talk to the sailor and he will take you to iron island.
On iron island at the last room.
riolu
I caught mine in iron island
For Diamond, Pearl, and Platinum, it's inside Iron Island.