NO (only on ruby)
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Sorry no, you can not get Kyogre and Groudon in Emerald before beating the elite four. After the Elite four have been beaten, talk to the weather man and go through the series of events. Repeat after obtaining one or the other to get the second. Level 70's be prepared. Sorry for the misfortune. :(
This depends on what game you are playing. In Emerald, after you beat the Elite Four, there will be a TV broadcast talking about a drought. Go to the route they name and find the cave. Inside the cave will be groudon. In RUby, before you can battle the eighth gym leader, you will have to battle groudon. You cannot catch Groudon in Sapphire
After you beat the elite four and the galactic biulding
no
Nothing much would happen, but you must defeat it or catch it before you can battle the elite four