It can't be done.
no you can't you have to either trade or gameshark cheats :P
No, you cannot. Because you have to put the codes into the GameShark itself and then put your game in.
no you must have a gameshark to use gameshark code because there is no other way to enter them into the console but if you get a gameshark then many codes come downloaded on them so you don't have to type them in GET GAMESHARK THEY ARE AWSOME
No.
you can't catch it until you don't have a gameshark because its impossible to catch without gameshark
you cannot do any ceat coades without a gameshark
First you go and get a gameshark.
no
You can't catch Groudon in Sapphire. Groudon is avaible only in Ruby and Emerald.
The only way to get a Groudon without cheating or migrating is to trade with someone else who has one.
it's impossible without mystery gift action replay or gameshark
you cant get it without migrating.