There is a cave called tanoby key on seven island in there you must push all the boulders on the little circles its a pretty tough puzzle but once you finish it go back to the tanoby chambers walk around for awhile and all you will find are the Pokemon unown which look like the alphabet. Psst in the viapois chamber and monean chamber there are a exclamation mark and question mark unown but there super rare.
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you can find it in the viapois cave of the tanoby ruins
i am not sure what question is but try going to tanoby key( little cave before ruins) and push boulders into the slots. that will make unowns appear
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.
In Pokemon firered you can't, but in Pokemon leafgreen you can get it then trade it to Pokemon firered.
To get Pokemon firered on PC download a vba and Pokemon firered ROM