First become Pokemon champion then go to the weather institute which is placed southwest of fortee city go to the top and talk to the scientist he tells you of a drought or a heavy downpour on a certain route depending on the weather condition you can find a secret cave on the route he mentions which leads to kyogre and groudon.
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Yes, You can catch Groudon in Pokemon Emerald.
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
its on route 115 but you have to have kyogre,groudon and rayquaza
you can`t catch kyogre or groudon or both of them without linking them from sapphire, ruby or emerald version.
You can catch any Pokemon with any ball it all depends on luck.