only in soulsilver is groundon and in heartgold is kyogre. if you have all 16 badges on either game, and went to professer oak and chose one of the kanto starters, go to mr. Pokemon and he will give you a orb. either the red orb or the blue orb. then go to embedded tower. hint where it is: its on route 47 and you will need surf and rock climb to get to embedded tower. remember: red orb for groundon and blue orb for kyogre! enjoy!
You trade/migrate from ruby or sapphire.
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Groudon is unavailable in heartgold. You can only catch Kyogre. If you want groudon, you will have to trade from heartgold, or migrate from another game.
kYOGRE AND GROUDON ARE IN POKEMON MOVIE UR MOTHER
The cool legendaries you can get in Soulsilver/heartgold are the following: Lugia, Ho-oh, Raikou, Entei, Suicune, Articuno, Moltres, Zapdos, Mewtwo, Latias, Latios (Latios in Soulsilver & Latias in Heartgold), Kyogre, Groudon, Rayquaza (Kyogre in Heartgold, Groudon in Soulsilver & Rayquaza if you have both).
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 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.