You have to find Terra Cave and go inside. Then go through a maze and find Groudon. Make sure to bring 50x Ultra Balls and maybe even a Master Ball. He is level 70, so be ready!
It depends on which game you are talking about. If its Ruby/Sapphire go to the cave in Sootopolis City and navigate the floors then catch Groudon using any Poke Ball (i recommend using an ultra ball) but if Emerald just go with the first answer.
1 you must get the red orb 2 go in the cave of orgen
you simply go to weather institute and talk to the guy who gave you cast form and he says theres bin a drought on a certain route (it changes each time*)
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Yes, You can catch Groudon in Pokemon Emerald.
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
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.
you can`t catch kyogre or groudon or both of them without linking them from sapphire, ruby or emerald version.
you just need to get the master ball off the galactic grunt boss it has a 100% catch rate hope i helped or you can buy lots of ultra then go to terra cave (thats where find and weaken groudon down real low like about its about to faint but dont kill it then try to catch groudon with an ultra ball this will take patience.........lots of patience