1. Repels (optional) (so wild Pokemon wont pop out.)
2. The HM move cut, already taught to a Pokemon.
First, fly to Eterna City and head left, to Eterna Forest.
Then use cut on the trees near the place you just entered from, walk inside the house.
Then walk in the kitchen. (Down Stairs room, in front of the entrance.) Keep walking in and out until you see a butler's ghost walk left. He disappears after.
Then walk in the door that's upstairs,center, and walk to the right. Enter the second to last room in and out until you see a little girl walk out the room to the right.
Some people say they see another ghost walk down the stairs, I don't know if that's true... anyway's rate and don't give me a thumbs down please