you can't.
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Apparently Groudon, but you need to trade with ruby to be able to obtain him.
Ruby and Emerald.
Groudon is a Ground type legendary Pokemon and the mascot of Pokemon Ruby. It can only be found in Pokemon Ruby, Pokemon Emerald, and in Pokemon SoulSilver is the player obtains a Red Orb.
you can't you have to trade him through ruby
Groudon. That's it.