it depends on which game it is. on diamond peral and platinum its in the solocean ruins
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Push the rocks onto the holes in the cave you'll see before you reach the ruins on seven island. Then the unown should be found common in the ruins.
you find them to the east of solaceon town , where you see a bunch of rocks
You have to catch the other 26 Unown first.
Each letter of Unown has its own room, which means that you cant catch all types of Unown in the same room. But you can catch multiple copies of the same Unown in its room.
If you catch 26 Unown in Pokemon Diamond, go to Ruin Maniac Cave. He will be waiting inside for you. You can catch Hippopatos in the cave, along with Geodude. Go to the end of the cave where there is another entrance. Go through, and when you get inside, you will see a writing on the wall. It says, "?!" Those two Unown are in there. Capture them. You now have all the Unown.