You have to teach a Pokemon Rock Smash and go to various places and there might be a chance of getting a Heart Scale or a Shard or something else, even a Fossil, but there is always the chance of a Pokemon Battle instead, and sometimes neither happens.
or you could go to the pokeathlethon and buy a heart scale from the girl at the farthest right. (not the girl right next to the sign up for com. and you) Then you talk to her, she asks if you want to have a prize exchange, you answer yes and on the first page you can see a heart scale, but you have to play the pokeathlethon enough times so you can get points. the heart scale is 1,000 points
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hg ss when you go to blackthorn city go to the house to the left and talk to him and he will teach you a move if you have a heart scale
there isn't one. instead, there's the move tutor house in blackthorn city, which takes heart scales. mushrooms in hgss have the same porpoise as nuggets.
you use it for the move maniac who reteaches your Pokemon a moves for one heart scale
if you get the Pokemon that the newspaper guy wants he will give you a heart scale and some rear poke balls
Catch a bunch of luvdisc they can hold heart scale.