An odd keystone can be placed on top of the Hallowed Tower at Solaceon Town to obtain Spiritomb. But you'll have to meet 32 people underground. Once've you've done that, press A in front of the Hallowed Tower and Spiritomb will appear.
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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 find the odd keystone and go to the tower. Then face it and press a.
you press the a button on it when you get the odd keystone. to get spiritomb there,you have to meet 32 people underground.
in a house
You walk up to the crumbled tower and press "A" and it will say the odd keystone looks like it will fit.