no it is like a story mode Pokemon
You can not see kyogre in emerald
Kyogre, you can get it from a trade or from Sapphire or Emerald.
Rayquaza, Groudon, Kyogre, Regirock, Registeel, Regice, Latios/Latias, Mew (event only), Deoxys (event only), Lugia and Ho-oh (also event only). -And Jirachi-
I do not know if you can catch Kyogre in Emerald but if you could, Kyogre will be in the Cave of Orgin at Sootopolis City. ;) ANSWER At marine cave, but I dont know how to get there
Kyogre is available in Emerald and Sapphire but not in Ruby.
you beat Archie on emerald
Including the event only's here are the legendaries in emerald: Latios/Latias, Kyogre, Groudon, Rayquaza, Deoxys, Regice, Registeel, Regirock, Mew.
You can't get Kyogre in Pokemon Ruby but you can get Kyogre in Pokemon emerald and sapphire and in ruby you only get groudon and rayquaza. In sapphire you get Kyogre and rayquaza and in emerald you can get groudon, Kyogre, and Rayquaza.
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Go to the weather institute where you got the Pokemon "castform." The guy that gave you it will tell you to go to a route. Go there and look for a cave, dark water or things like that. It is usually raining. Warning: Make sure to bring Pokemon that know the moves dive and flash. Note: You will need to beat the elite four before you can capture kyogre.
Of course you can. If a special event in Heartgold requires an event Kyogre, then you would need the event Kyogre to trigger that event rather than any Kyogre from any other game.
In Pokemon Emerald, Groundon and Kyogre are legendary Pokemon. You can find them in the Marine Cave and the Terra Cave.