you get an explorer's kit from a guy in a hous ein Eterna city, go outside, go to key items, click it and you will go underground.
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You have to go to the underground.
you need to go underground
you have to go underground and dig for him
go underground with explorer kit and get a claw fossil
To find heart scales on Pokemon diamond/pearl you need the explorer kit to go underground. once you are underground look for cracks inthe wall, and eventully you will find a heart scale in the cracks.