You cannot find heart scales there. You have to go underground, go digging, and maybe you'll find one.
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Heart Scales can be purchased in the Pokeathlon shop for 1000P
Heart scales can typically be found underground by using the Explorer Kit.
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.
first go to Mr. Pokemon first have the red scale and he will give you it
you use it for the move maniac who reteaches your Pokemon a moves for one heart scale