I think its worthless.
^ Wrong. although it can be sold at a high price, it's also valuable to the trainer in case s/he would want one of their Pokemon to relearn an old move from a Move Tutor. But also: "Unfortunately, Heart Scales do not work with the Move Tutor of Pokemon LeafGreen and FireRed. That particular Move Tutor only wants big or small mushrooms. So the Heart Scales have no other purpose in FireRed like they do in Ruby, Sapphire, Diamond or Pearl." Even if this is so, you can still transport Heart Scales to any of the games mentioned (just trade your Pokemon holding heart scales).
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i do not think you can but you can take Pokemon to the heartscale guy and see if that move is compatible with any of your Pokemon you give him a heartscale that you find under ground he collects them
It is used for the move tutor, who teaches you Pokemon old moves that they have forgotten.
Mistralton City the house next to the entrance for a heartscale
In Pokemon firered you can't, but in Pokemon leafgreen you can get it then trade it to Pokemon firered.
To get Pokemon firered on PC download a vba and Pokemon firered ROM