unfortunately you can't.
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The Rare Bone item has no practical use in Pokemon Platinum or any version of Pokemon. The Rare Bone's only purpose is to be sold to in-game shops for money similar to how the Nugget item is used.
In the wild or from professor oak
i found them at walgreens but, they sere a speciality item and sold not to get any more. geez
The game does not allow you to sell key items and the Secret Potion is a key item.
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