All the unknown can be found in tanoby cave which is on the 7th island. They only show up in the cave after you solve the rock puzzle at the end of the cave which is fairly easy to do. Yes, i agree with the 1 above me...but go to this website (http://www.serebii.net/red green/unown.shtml) and it shows you where every unown is found. I used it and am now looking 4 my legendary dog!
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go to 7 island
i think its unknown but im not sure... >.<
u can get all of them...
In Pokemon firered you can't, but in Pokemon leafgreen you can get it then trade it to Pokemon firered.
You have to do all of the puzzles first, then you can get all of the unknown.