You need to complete Pokemon Sapphire and Diamond and in Diamond you will need the National Dex. Go to the title screen of Diamond and press Start, then choose "Migrate from Sapphire" and follow the instructions. Choose the 6 Pokemon you want to migrate to Diamond, then confirm your choice. The 6 migrated Pokemon will be in the Pal Park and can be caught with 100% catch rate.
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You have to trade it from either Ruby, Sapphire, or Emerald.
Trade them in from Ruby/Sapphire/Emerald.
Migrate from Emerald, sapphire, ruby, or trade with heartgold and soulsilver
No. But you can trade from FireRed, LeafGreen, Sapphire, Ruby or Emerald to Diamond, Pearl or Platinum
There are two ways of getting Groudon on Pokemon Diamond. The First way is trade it with people in the GTS (Global Trade Station). Or you can migrate it from Pokemon Emerald, Ruby, or Sapphire.