There is no Groudon in Pokémon Crystal.
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.
Groudon is unavailable in heartgold. You can only catch Kyogre. If you want groudon, you will have to trade from heartgold, or migrate from another game.
Wailord is the largest Pokemon followed by groudon.
Groudon can be found at: Cave of Origin, Terra cave.
Groudon is AWESOME!
There is no ruby in groudon.
groudon is better
groudon
Groudon is from the hoen region.
Groudon's cave is in sootoopolis.
At ruby version Groudon is level 45, at emerald Groudon is level 70.
No, Groudon does not evolve in Pokémon Ruby.
the password for groudon on pokepark wii is.... GROUDON: 45594012
Groudon does not evolve, therefore no stone will make Groudon evolve.
you can't find Groudon
Groudon is on level 50.