There is no Groudon in Pokémon Crystal.
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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.
find groudon at the magma cavren and kyogre at marinea cave
In Pokemon Crystal.
What the hell is a Pokemon crystal
Groudon isn't in Pokemon Pearl. The only way to get Groudon is to trade it from the GBA game, via Pal Park, or to cheat.