That is unknown.
You can't. It is specific to Platinum.
Yes you can at the Solaceon Ruins. Battle/Catch 99 Unknown and the 100th Pokemon you see will be Celebi.
You can buy them in Sunnyshore City or show unknown to the boy in Solacean town.
You may need to find a trainer who has an Unown (sometimes wrongly spelled as Unknown) to complete your Pokedex. You can find someone who has it in the Solaceon Ruins.
The Solaceon Ruins.
no, these Pokemon are unknown in Pokemon platinum
They are the alphabet :)
you can get seals with the unknows
That is unknown.
In Diamond it is in the ruins with the Unknown, I am not sure about Platinum though.
It's currently unknown which countries Pokemon Platinum is gonna be launched anywhere else, other than Japan.
lightening bolt
You can't. It is specific to Platinum.
You can catch unown in the Solaceon Ruins.
You can find the M form of Unown in the Solaceon Ruins of Pokemon Platinum. This form of Unown appears in the dead-end rooms of the Ruins.
Yes you can at the Solaceon Ruins. Battle/Catch 99 Unknown and the 100th Pokemon you see will be Celebi.