Actually you will not be able to find a Groudon in pokemon black or white. It's because you will not be able to find a Groudon in the wild. The only way you can get Groudon in pokemon black and white you will have to trade with someone who has a Groudon or you can use Global trade.
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You can't. Only can be obtainable by PokeTransfer.
In Pokemon Black you can actually get quite a bit of legendaries. You can Get Reshiram, Kyuram, Giratina, and Arceus. Also Kyogre and Groudon.
Yes, You can catch Groudon in Pokemon Emerald.
kYOGRE AND GROUDON ARE IN POKEMON MOVIE UR MOTHER
There is no Groudon in Pokémon Crystal.