i think your suposed to tap it while its still to spin the peice hen you can make omante by the way you fall in a hole!
This page has a picture of the completed puzzle: http://www.upokecenter.com/games/gs/walkthru/ruinsofalph.php
in union cave you need to go down the ladder by the scientist, surf in the water and look in that cave till you find a boulder. move it and exit the cave, hop down the ledge and into the other cave. there you have it!
you just run through the pattern
First go to the Ruins of Alph then go to the first puzzle room then try to complete it if you do then you will fall to the big room then the Unown will appear.
In Pokemon heart gold & soulsilver you must complete all the puzzle and have unlocked all the areas before you are able to get all the unknowns
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)
You have to trade it from HeartGold, in the ruins of alph when you use rock smash on the rocks you can find the Dome Fossil(for kabuto) but that's only for SoulSilver, the Helix Fossil(for Omannyte) is only found in HeartGold
take it to the pewter museum and talk to the guy with the black hair he will take your fossil and make it into an omanyte
you have to complete the hoenn pokedex and then i think you get to chose 1
You go to the 6th gym.
you have to go right in front of the traners its the only way to get to pryce.
, Growlithe, Arcanine, Omanyte, Omastar, , Ariados, Gligar, Mantine, , Sableye, Baltoy, Claydol, Anorith, Armaldo, Kyogre, Mantyke and Gliscor are all exclusive to Heart Gold.