Instructions
Defeat all eight Gym Leaders, the Elite Four and the region̵7;s current Champion.
Go to the Trick House located in the middle of Route 110. It is a two-story house with a purple-colored roof.
Talk to the Trick Master inside, and complete the first seven puzzle rooms. The puzzle is solved once you find the exit on the far wall -- that leads to the Trick Master̵7;s room.
Enter the eighth room, and slide along the greased floor until you reach the line of green tiles in the middle of the room. Walk along the tiles, and pick up the Bead Mail.