Nothing much would happen, but you must defeat it or catch it before you can battle the elite four
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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
you can`t catch kyogre or groudon or both of them without linking them from sapphire, ruby or emerald version.
catch poocheana and zigzagagoose and then they will eat your Pokemon and then you get a free deosyxes and the latios plus jirachi and kyrogue/groudon catch poocheana and zigzagagoose and then they will eat your Pokemon and then you get a free deosyxes and the latios plus jirachi and kyrogue/groudon
NO (only on ruby)
Apparently Groudon, but you need to trade with ruby to be able to obtain him.