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It is Altering Cave which you can enter only after you beat the Pokemon league.
If there is a Drought in a Route on Pokemon Emerald it means Terra Cave has appeared in that Route. Terra Cave is a randomly spawning cave that contains the legendary Pokemon Groudon. Terra Cave only appears after defeating the Elite Four.
its very easy :) hafter beating Pokemon league go to slateport city and head at route 103. go to that lake at this route and what is that?IT'S A NEW CAVE!!!! and the cave its named ALTERING CAVE
how 2 get in the under warter cave on Pokemon emerald
Kyogre is the name of a Pokemon only available in the Pokemon Sapphire and Pokemon Emerald video games. Kyogre can be found in the Cave of Origin, near Sootopolis City, in Sapphire, and it appears in the Marine Cave in Emerald. The location of the Marine Cave changes periodically in the game.