A Heart Scale is a scale that is shaped like a heart and in most games with the exception of FireRed, LeafGreen and XD are the items that are used as payment in exchange for the Move Reminder's services of helping one of your Pokemon to remember either a forgotten or missed move.
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underground
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.
no you cant it is impossible, but you could get999 with action replay.
You can use heart scales at the Move Re-learner in Pastoria City. He reteaches your Pokémon a move for every heart scale used.
Heart Scales can sometimes be found on Luvdisc when they are caught.