If you don't know this is cost for one usage of Move Relearner (in Dendemille Town) skills.
Where and how can I earn Heart Scales
pokemon-x-y
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Best Answer
Fish with the old rod at Route 8, 12, Ambrette Town, Azure Bay, Cyllage City in Pokemon X or Y. You can steal them from Luvdisc with a 50% chance of them being held.
Or you can get one daily from Tierno in Couramine City after beating the Elite Four, if you have a Pokemon knowing the move he wants to see.
I had stolen about 10 heart scales in a matter of minutes.
Edit: If you want to kill 2 birds with one stone, use a Pokemon with the move called "Covet". Not only will it steal the item, but it will damage the target pokemon in hopes of fainting it to gain experience.