You show it to Professor Oak. After that, he'll ask you if you can obtain a Kyogre, which is only available on Pokemon Heart Gold. Once you obtain a Kyogre, put both Groudon and Kyogre in your party and show it to Professor Oak. He'll give you the Jade Orb, which enables you to catch Rayquaza.
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Yes, You can catch Groudon in Pokemon Emerald.
After catching Kyogre, obtain a Groudon from a friend with Pokemon SoulSilver. You only need the Groudon temporarily. Talk to Professor Oak with both in your party, and Professor Oak will give you the Jade Orb to catch Raquayza.
What you do is trade that Kyoger to a friend that has Pokemon soul silver for Groudon show that Groudon to Mr.pokémon and he will give you the Jade Orb with that orb you will be able to catch Raquaza. hope this helped
You have to have both Kyogre and Groudon. You get the Red Orb from Mr. Pokemon to catch Groudon in the Embedded Tower. In addition, the Groudon has to be from SoulSilver and the Kyogre must be from HeartGold. Show them to Professor Oak for the Jade Orb to awaken Rayquayza.
After beating Red, you can catch Groudon. If you have caught him and trade for a Kyogre you can also catch Reyquaza.