You go to Ruins of Alph in Johto and solve all four puzzles of ancient pokemon, Kabuto, Ho-oh, Aerodactyl, and Omanyte. If you solve it correctly you will fall into the Unown cave and for each puzzle you solve more unowns will appear. If you solve all the puzzles you should have unlocked all the unowns and should be able to catch all of them if you have patience.
(If you don't fall in the cave that means you haven't done the puzzle correctly)
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28
The alphabet so 26+2 because of the ? and the ! unknowns.
In Pokemon diamond/pearl go to Solocoan town and go to the ruins and in heart gold and soul silver you need to solve one of the tiles
there in the same place as Pokemon dimond
You catch unknowns.