You can try to get the other kind of orb which will get you kyogre and after you get kyogre you can go back there and get rayquaza.
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you cant but you can trade it from Pokemon soul silver
you go back to the cave where you caught groudon/kyorge
if you have action replay you will get to pick a pokemon so groudon is a hard pokemon you need the red orb for groudon on pokemon soul silver version or pokemon heart gold version but use action replay on pokemon pearl,diamond,platinum
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
go to prof. oak he will give you the blue/red orb go to the embedded tower and you will see groudon