Unown
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Unown. The 201st pokémon. With only one move and pathetic stats, this pokémon is pretty much useless for serious battling. No, the unowns' main allure is their shape: there are 26 forms of unown, each of which looks like a letter of the English alphabet. (Plus two more, which look like the punctuation marks ! and ?).
And so, this page does not focus on battling at all, but the locations of the Unown, in an attemt to help you collect all 28 forms.
FireRed/LeafGreen
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In these versions of the game, the unown are found on Seven Island of the Sevii Islands. They are distibuted throughout 7 different ruins, each of which contain only a few forms.
Here are the rarities of each form, and which chamber they can be found in:
Dilford
* P 40%
* L 20%
* J 20%
* R 14%
* Q 6%
Weepth
* N 60%
* S 30%
* I 8%
* E 2%
Rixy
* V 50%
* W 30%
* X 10%
* M 8%
* B 2%
Scufib
* Y 40%
* G 25%
* T 20%
* F 13%
* K 2%
Liptoo
* C 50%
* D 30%
* H 14%
* U 5%
* O 1%
Monean
* A 99%
* ? 1%
Viapois
* Z 99%
* ! 1%
Diamond/Pearl
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In diamond and pearl versions, the unown are found in the Solaceon Ruins.
The ruins take the form of a few main chambers and many dead ends. If you find your way through the ruins you wind up in a room with a few items and an inscription on the wall.
In each of the main chambers (including the entrance and final room), there is a single form of unown which you can run into.
Proceding through the main chambers, you will find these forms:
1. F
2. R
3. I
4. E
5. N
6. D
As you can see, they spell "friend".
In the dead end rooms you can find every other unown form except ! and ?.
The dead end rooms do not seem to have a pre-determined set or rarity of unown forms, other than excluding the FRIEND and !? unown.
Since the form of a particular unown is usually determined from its [Personality ID][1], I don't know if the formula used for exclusion results in an even distribution of unown forms or not.
The unowns' levels range from 15 - 25.
The ! and ? unown forms can be found once you have seen every other unown form.
Once you have, go to route 214 and enter the now- Ruin Maniac's Tunnel. At the other end, you can enter a previously unreachable room where you can find the ! and ? unown, along with another inscription.
[1]: http://upokecenter.com/games/rs/guides/id.html