you have to use hm rock smash on rocks to find them.
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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.
Heart scales are found in cianwood? i never knew that! you can get heart scales in the pokeathlon too. also a guy in blackthorn will trade a heart scale to make Pokemon remember moves
you find him in the ruins of alph by weeds and you can find smeargle on there same thing on Pokemon heart gold (natu evolves at level 25)(smeargle no evolvetion)
just run in the grass
near safari zone were the grass is