Marine Cave.
if you mean between kyogre and groudon, then the battle in sootopolis.
u hawe to win the battle dome 10 times and do to your Pokemon kyogre if you don't have kyogre you can go to the to your home and talk to your Pokemon swampert THAT MAKES NO SENCE
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Only in Emerald Version do you have to search for Kyogre. In Sapphire, you just go to the Cave of Origin to battle Kyogre.
Use a teleporting one or just beat the elite four
You can, unlike other games in the series. You just have to leave and re-enter the room, and Kyogre will be there for you to battle again.
u complete the battle fronteer and go to sootopolis city. navigate through the town and go in the cave. Kyogre is inside.
You can not see kyogre in emerald
go to the sea lair
you fionf him in cave where you battle archie im pretty sure
You can go to the battle frontier, catch groudon and kyogre, and go to the secret place in the safari zone where you can catch Pokemon from the johto region.
You don't get Kyogre in Ruby; instead, you get Groudon. If you want Kyogre, you have to trade one from a Sapphire or Emerald game.