You can't get it. In Soulsilver you get it by going past cianwood city to the embedded tower after you get the red orb from Mr. Pokemon after you get the national dex and the kanto starter from professor oak
groudon is in pal park in the mountain area
You must MIGRATE!!!!!!!!!!!!!!!!!!!!!!
Go into the groudon cave and beat team magma. and then catch groudon with ultra ball or timer ball.
You trade Magmar from Pokemon pearl,diamond,or platinum to ether Pokemon pearl,diamond,or platinum.
You have to wait until you beat Pokemon Black/White and obtain the National Dex before you are able to transfer Pokemon from Diamond and Pearl.
groudon is in pal park in the mountain area
the only way to get groudon is to either import it from Pokemon sapphire/ ruby/ or emerald, OR, trade it from pearl/diamond/or platinum.
There is no real way to get groudon, but you can just migrate it, or have a friend trade it to you.
Migrate it.
In Diamond & Pearl? Impossible without migrating, trading, or Action Replaying.
Groudon does not appear naturally within the game. Transfer it from Diamond pearl platinum soulsilver or heartgold.
there are 150 kinds of Pokemon that you can see and/or obtain. Unless you have friend trade you Pokemon that you can only get in pearl to you, you'll never obtain them all. In Pokemon diamond and pearl all you have to do is see the Pokemon and you get its data unlike the older versions where you have to obtain them.
darkrai and arcus
Milktank is located in route 209 and 210 in both Diamond and Pearl.
you get groudon from a certain fossil
No, you do not need diamond and pearl to obtain all the Pokemon in the national pokedex. You either need to have a friend who has all the older Pokemon, or you could transfer the Pokemon yourself from older games.
IT IS NOT IN POKEMON DIAMOND OR PEARL BECAUSE IT IS ONE OF THE STARTING POKEMON IN LEAFGREEN!!!!! Migrate one from firered or leafgreen.