The Move Tutor's house is in Fallarbor Town to the left of the Pokemon Contest Hall.
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if you get the Pokemon that the newspaper guy wants he will give you a heart scale and some rear poke balls
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Take it to a move tutuor, and he will teach you a move in trade for a heart scale. 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.
In Driftveil, there is a lady who will give you one Heart Scale a day if one of your Pokèmon has the move she wants to see. Her house on on the far left, just above the Driftveil Market.
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).