you cant they only come in the 3rd gen of pokemon sorry guys
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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.
A Heart Scale is a scale that is shaped like a heart and in most games with the exception of FireRed, LeafGreen and XD are the items that are used as payment in exchange for the Move Reminder's services of helping one of your Pokemon to remember either a forgotten or missed move.
Yes.
No only in ruby and sapphire and emerald.
you use it for the move maniac who reteaches your Pokemon a moves for one heart scale