How do you relearn moves your Pokemon forgot in Diamond Pearl?

Answer 1

First you need a Heart Scale to give to the tutor. You can find one by going underground and digging there. The more moves you want to relearn, the more Heart Scales you need. Then Go to Pastoria City and walk down ( near the lake, inside the city ). You will see a house beside the lake. The house will have a guy outside it who will say, " Here where I am standing, I'm Smack-dab in the middle of town." Go inside the house and talk to the guy to relearn a move.