Things You'll Need
Instructions
Return to the Sky Pillar at the end of the game (after you̵7;ve collected all eight gym badges and defeated the Elite Four.)
Use your mach bike to ride over the crumbling sections of the floor. Do not stop your bike; if you lose momentum you̵7;ll fall through the cracks in the floor.
Save your game when you reach the top floor and see Rayquaza.
Approach Rayquaza and press the ̶0;A̶1; button to start combat.
Use a high-level Pokémon to induce paralysis or sleep with attacks like ̶0;Thunder Wave̶1; or ̶0;Hypnosis.̶1;
Use powerful electric attacks like ̶0;Thunder̶1; to bring Rayquaza̵7;s health down to the red. Note that Rayquaza has the ̶0;Rest̶1; attack which will fully restore its health and put it to sleep for two turns.
Throw an Ultra Ball when Rayquaza̵7;s health is in the red and it̵7;s either asleep or paralyzed. Repeat this process until you caputre Rayquaza. Note that you may have to attempt this several times. If you run out of Ultra Balls or accidentally defeat Rayquaza, reset your game and pick up from where you saved.