you can find it in the viapois cave of the tanoby ruins
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These Pokemon can be found in the tanoby chambers on seven island these Pokemon look like the alphabet if you look carefully in the monean and viapois chamber you can find an exclamation mark and question mark unown.
if you catch all 28 unknown, including the exclamation mark and question mark unowns, the unowns will spell the alphabet and question & exclamation mark unowns i really dont know what they do.
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.
Unown (?)
After you catch ALL the other unknown, go to the ruin manic cave. go all the way down it, and in the room at the end of the tunnel, you can catch the exclamation and question mark unknown!