after you find the underwater cavern and defeat Maxie, he is in the cave of origin in sootopolis.Get lots of ultra balls because you'll want to save your master ball for latios.
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Apparently Groudon, but you need to trade with ruby to be able to obtain him.
Ruby and Emerald.
you can't.
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