Rayquaza
Before getting the legendary dragon pokemon Rayquaza, you have to do the pokemon league.
After that fly to Pacifidlog town and surf off towards the pokemon league. You would of noticed a large opening on the edge of the route.
Go in there and you will come to a place called Sky Pillar (you'll need a mach bike for this).
Make sure you have your toghest pokemon on you because you will encounter Rayquaza at the top of Sky Pillar at level 70.
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