After Groundon dissappears go to Sootopolis and find Steven, he will show you the way to Wallace. Find Wallace and he will tell you about Rayquaza. Tell him he is at Sky Pillar and then go to Sky Pillar and awaken Rayquaza.
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Yes, You can catch Groudon in Pokemon Emerald.
you cannot get groudon in emerald
You don't awaken him until you beat the elite 4. Then go to the weather institute and they will tell you where to go for each Pokemon KYOGRE/GROUDON.
Ruby and Emerald.
Groudon is obtainable in Pokemon Emerald only after you beat the Elite Four. After you do so, go to the Weather Institute West of Fortree City, and go to the Second Floor. Speak to the scientist on the far left and he will tell you where Groudon is. You can do the same tactic for Kyogre.