You can't. Only can be obtainable by PokeTransfer.
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Yes, You can catch Groudon in Pokemon Emerald.
You can't catch it in Black, but you can catch it in White. In the White Forest.
you have to get in Pokemon white
Yes you can catch Reshiram in Pokemon black and you can catch zekrom in Pokemon white hope it helped.
not catch but by Pokemon transfer or the Dreamworld