You solve the stone panels in the Ruins of Alph. If you dont solve the stone panels, you will find no UNOWN.Dont ask me why I wrote UNOWN that way.
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After collecting all 26 Unown, talk to the scientist and he will let you print out your Unown shapes.
If you solve all 4 puzzles it will unlock the 26 "letter" unown. If you open the 4 back rooms (using an escape rope, flash, water stone, and Ho-Oh), catch all 26 unown, and talk to the researcher in the building it will unlock the ! and ? unown. Catch them and talk to the guy again. This will complete the unown side quest, but that's about it. Nothing really special unless you just really have to have all 28 unown.
The tunnel on top the ruins is accessible.The tunnel is where you catch the ? and ! Unown.
You have to catch all 26 unown and talk to the scientist a few times for additional pages.
In Diamond/Pearl/Platinum, after you have caught all the Unown the Maniac Tunnel on Route 214 will be fully accessible, now you can catch the "?" and "!" Unown.