Take a marvelous Pokemon that can learn the HM Rock Smash and smash every rock you see :) Heart Scales are there but they will be in the rubble. I've already found 2.
Hope this helps--Taylor
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You can smash rocks randomly to try to get one. If you don't want to go through trial and error, you can earn 1000 points in the Pokeathlon and trade them for a Heart Scale.
On heart gold, it can be found by smashing the breakable rock beside the pokemon school. I think you can also find it in this location on soul silver.
In Pokémon SoulSilver, Mankey will already have Covet as a beginning move and if it doesn't have it as a move when caught then you just need to take a Heart Scale to the Move Re-learner in Blackthorn City in order to teach Covet to it.
If it's like heart gold for this, then catch the red guarados, and u should get a red scale, go to mr.pokemons, house, and he will want to trade your red scale for his exp.share. Say yes, and u have an exp.share
The dragon scale evoles seadra to kingra.When you trade seadra holding a dragon scale it will evolve to a kindra!