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Yes, You can catch Groudon in Pokemon Emerald.
Of course find groudon in terra cave save before attempting to capture it then when you see it if its not a brownish color keep resetting the game until its shiny.
No you can only get groudon in Pokemon ruby or emerald and transfer through Pal Park or if you have heart gold or silver soul you can catch and trade groudon to yourself
Groudon is unavailable in heartgold. You can only catch Kyogre. If you want groudon, you will have to trade from heartgold, or migrate from another game.
you can`t catch kyogre or groudon or both of them without linking them from sapphire, ruby or emerald version.