It is Pokemon Ruby, Emerald, and I think it could be Sapphire too.
You have to have a Gameboy Advanced though.
in the land cave.
With a master ball. It is the only way but to get a master ball you must cheat.
well there is a grondon one but you have to trade a rayquaza for a grondon in dimonn and trade for kyogre is platinom and so on said my school friend who said that there whas a pokemon 2000 game, basicly theres none
you simply have to beat the elite four and go to mr pokemons house and he will give you it
You can catch Groudon only once you have defeated the elite Four. Once you do that, go to the weather istitute (in between Watson's and Winona's towns) and talk to the head scientist. He will tell you where there is either a drought or a large rain storm. Where he tells where one of the things are is where one of the two legendary Pokemon are (Kyoger if it is rain, Groudon if it is a drought). You have to catch the first one to get the second one.
to find the jade orb you need grodon and kyouger so you need to trade from soulsliver to get grondon and catch kyouger in heart gold and then you need to go to profeser oak in pallet townand he will give you the jade orb
In Pokemon Leaf Green, you can catch Pokemon in the grass, water, or in a cave.
A Weedle.
Near the 6th Gym in Fortree City, there is a Weather Lab (it was invaded by team Aqua, I think). On the top floor, there is a scientist who gave you a Castform. Talk to him and he'll tell you that there is a drought or heavy rain in a certain route. Go to that route. There will be an extra cave opening there. If you enter that cave, Groudon or Kyogre will be there.
you cannot catch the 3 regi's in Pokemon platinum you have to catch them in Pokemon emerald then transfer them to Pokemon platinum. thnx
In Pokemon black you catch RESHIRAM and TORNADUS In Pokemon white you catch ZEKROM and THUNDERUS Sources : myself
In Pokemon Diamond and Pokemon Pearl, there is no possible way to catch a Giritina. You can, however, either catch one in Pokemon Platinum or trade with someone who does have one. In Pokemon Pearl, you catch Palkia at Spear Pillar. In Pokemon Diamond, you catch Dialga at Spear Pillar.