Primal Groudon is very able given that it is brimming with energy which comes from its body as magma.
Chat with our AI personalities
Since Groudon is a ground type go for a Ice-type or Grass-type move. Yes, I know that Ground-types are also weak to Water-type moves, but since Groudon has a Drought ability, Water is not as effective because of the sunlight. However since the drought ability boosts the effect of grass type move. In this case, use a special attack move (Groudon is slightly weak to sp. attack) like Solarbeam. This will do massive damage. Another hard-hitting move is Blizzard, an Ice-type sp. attack move. If you want to catch it, I would use a Physical Attack Water-type moves like Aqua Tail. This will hopefully help you with that Legendary Pokemon!
Primal - video game - happened in 2003.
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.