How do you meet gray in harvest moon ds cute?

You can see Gray by using the phone in your house to call the Blacksmith shop when it is open.

To actually meet him you will need a DS with a GBA Slot and a copy of Friends of Mineral Town or More Friends of Mineral Town.

Insert your Mineral Town game into the GBA Slot of your DS and play Harvest Moon DS Cute like normal. Gray will visit every Thursday and on certain festivals.