if you show her the wanted Pokemon (she gives you a hint) youll get a heart scale
you use it for the move maniac who reteaches your Pokemon a moves for one heart scale
in pastoria city where the man says he is in the middle of the town the building next to him
to get a heart dive
no
if you get the Pokemon that the newspaper guy wants he will give you a heart scale and some rear poke balls
Catch a bunch of luvdisc they can hold heart scale.
beside solemn town's Pokemon healing centre there's a house and when you go in it there's a fat man that gives you a assignment and when you complete it you get a heart scale and a few poke balls.
catch a luvdisc, most of the time they will be holding a heart scale. fish for them. no, you can't buy a heart scale.
There's a man in Fallabur town who will re-teach a Pokemon a move for a heart scale. But you must find a heart scale, they are in several places on the map but are mostly in or near water.
you get them underground
Heart Scale does not evolve any Pokemon. You trade it to a maniac who will make Pokemon remember moves. In black and white, the maniac is in Mistralton city.