First, go to Solceon town. Near the exit at the top on your right there is a hidden opening; go inside!

There will be 4 ledges within; jump down the fourth one and you'll enter another ruin.

There is a kid in that ruin. Find him and talk to him so he will leave.

Go forth and catch all the Unown. They only know hidden power, so they can't do much damage to your Pokemon.

Go back to Solcean town and locate the same ruins. Jump down the third ledge (not the fourth one) instead to find a house.

The kid from the ruins will be there and if you speak to him after capturing all the Unowns, you get a Seals.

Submitted by Hope-for-trade (kikat28)