you can't catch groudon in platinum unless you have action replay. You can transfer it from emerald and/or ruby through pal park
it is Tentacruel
Groudon and Kyogre are unavailable on Pokemon Ranger.
Groudon is not in Pokémon Black.
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.
You can't
It is in Victory Road after you've seen the three boulders
You get Groudon in Pokemon Heart Gold by trading with somebody who's found Groudon in Soul Silver. You can't find Groudon in Heart Gold, you find Kyogre. Soul Silver players find Groudon.
You cannot find Groudon in Pokémon Black 2.
find groudon at the magma cavren and kyogre at marinea cave
Groudon is unavailible in Pokemon heartgold trade from soulsilver to get groudon.
Yes, you can find Groudon in the map called "Fuchsia City". It is catchable.