Things You'll Need
Instructions
Fly to Pacifidlog Town in Level 70. Approach the eastern coast of the town. Press "Start" to bring up the menu, select "Pokemon" and choose the Pokemon that knows the move "Surf."
Surf east onto Route 131. There are a few Pokemon trainers to battle in the water.
Travel along the northern path of the route until you see a cave on the beach. Enter the cave and follow the path until you emerge in front of the Sky Pillar.
Climb to the top of the Sky Pillar. On the second and fourth floors there are cracked tiles that will give way as you step on them, dropping you down to the floor below. Use the Mach Bike to quickly ride over the cracks and make your way up the tower. You may also encounter wild Pokemon such as Banette, Sableye, Claydol and Golbat.
Walk out onto the topmost floor of the Sky Pillar, where you will see Rayquaza waiting in the center.