There is one on Route 208 and in Twinleaf Town. It's also in the Underground.
The Odd Keystones are special items that can be found in the Pokémon games. In the Diamon version, they can be found at the Dowsing Machine in Twinleaf Town and also digging at the Sinnoh Underground.
Mainly just in case you get rid of the first one without knowing what to do with it. Other than that, it has no purpose.
In Diamond it is in the ruins with the Unknown, I am not sure about Platinum though.
After putting odd keystone in talk to 30 friends wirelessly and then press a in front of the keystone tower you will find spirittomb.
Odd keystones help unlock Spiritomb.
The Odd Keystone is the only one.
You can't. The Odd Keystone is only obtainable in Diamond, Pearl and Platinum. You will need to trade a Pokemon with an Odd Keystone to get it on SoulSilver.
You can find Spiritomb at Hallowed Tower Requires Odd Keystone and talking to 32 People total in Sinnoh Underground.
you get one from a guy to the east of hearthome city
you can find one in the solaceon ruins in a room where there 4 items one will be a odd incence one will be a nu
there is a old tower that is on route 209
firstly let me answer your question, your kind of, no really odd pokemons 4 gays