you go to that city on water and go to the right and up when you find an opening (after you beat the elite 4)
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No, there isn't. The legendary Pokemon for emerald is raquaza and that's it. when you finish the Pokemon league, you finish the game.
Sky Pillar they tell you at the harbor in lilycove
You can get Rayquaza aroung the 7th gym. You can easily vs them in the sky pillar. I suggest using a master ball.
you cant get reggiggas in Pokemon emerald
there is no mist stone in Pokemon emerald