You have to catch the other 26 Unown first.
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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.
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!
you have to catch a through z in unknown then go to ruin maniac from the bottom of veilstone city (cave on brown ground) he will let you through to catch ? and !
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.
The tunnel on top the ruins is accessible.The tunnel is where you catch the ? and ! Unown.