Go through union cave. One will require you to bring Ho-Oh, the other will require you to use a water stone in front of the tablet.
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You can catch Unknown in the Ruins of Alph (near Violet City.) You cam unlock more Unknown by completing the wall puzzles.
in pokemon LEAFGREEN/FIRERED you can catch them in the tanoby chambers after you unlock a puzzle in a cave in the sevault canyon called tanoby key using strengh. in pokemon GOLD/SILVER/CRYSTAL you must unlock at least one of the puzzles in ruins of the alph then unown well appear in the visitors room where you fall after after you unlock a puzzle.
you can read the unknown and you unlock ? and ! unknown
There are old buildings where those dots are... they have nothing in them. Apparently, you have to go to the trainer tower and unlock the tanoby key. Then the unknown Pokemon will appear in the ruins.
Beat all the turtles.