Answer 1

In Diamond you can find them being held by poliwhirls after you have the national dex. In Heart gold you can find them in the slowpoke well.

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Answer 2

In Heartgold, once you have surf, go to Slowpoke Well. In the cave with the Slowpoke, theres a ladder which can only be reached by Surf. In the cave is a TM (Rain Dance I think) and a Scientist. he gives you a Kings Rock.