first,talk to the man in the weather institute and he'll tell you where is the where the weird weather is and go to that place.When he tells you heavy rain in one place go there and find a entrance to DIVE in and you will meet kyogre.
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Yes, You can catch Groudon in Pokemon Emerald.
You can't catch one in Pokemon Emerald.
No you cannot catch Entei in Pokemon Emerald.
You can't catch a Bellsprot in Pokemon Emerald. You trade it from Pokemon Leafgreen!
There are many Pokemon you catch that are similar in sapphire and emerald but there are many Pokemon emerald can only get and not sapphire.