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.
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Yes, You can catch Groudon in Pokemon Emerald.
you cannot get groudon in emerald
you need to awaken Kyogre[in team aqua's hideout]Groudon[in team maga's hideout] and Rayquaza[in the sky pillar]
Ruby and Emerald.
first you got to awaken groudon and he is at route 112 going down the hill and kyogre is south of mossdeep city but i dont know exactly where