After defeating the Elite Four, go to the Weather Institute and a scientist will say "Presently heavy rainfalls was at..." It will either be Route 105, 125, 127, or 129. The scientist might say something about the drought. If you are not quick enough to get to the Marine Cave, it will eventually move away. Kyogre is the only Pokémon found in the Marine Cave. If you caught Kyogre at the Marine Cave already, the drizzle will stop and if you haven't caught Groudon before it, droughts will only take place now.
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Caves, Tunnels and Mountains
Rusturf Tunnel · Island Cave · Granite Cave · Desert Ruins · Jagged Pass · Fiery Path · Mt. Chimney · Meteor Falls
Scorched Slab · Ancient Tomb · Mt. Pyre · Shoal Cave · Team Aqua Hideout · Team Magma Hideout · Seafloor Cavern
Cave of Origin · Sky Pillar · Victory Road · Sealed Chamber · Altering Cave E · Artisan Cave E · Desert Underpass E · Marine Cave E · Terra Cave E
Places of Interest
|Other regions: Kanto (Sevii Islands) · Johto · Hoenn · Sinnoh (Battle Zone) · Unova · Kalos · Alola · Galar (Isle of Armor · Crown Tundra)|