From Bulbapedia, the community-driven Pokémon encyclopedia.
Terra Cave (Japanese: りくのどうくつ Land Cave) is a cave in Hoenn that only appears in Pokémon Emerald.
Unlike most other locations, the location of Terra Cave is not set at all; it can be determined by speaking with a man at Hoenn's Weather Institute, who will explain that one of four routes is under abnormal weather conditions. If the player does not reach Terra Cave fast enough, it will temporarily disappear and Marine Cave will appear. However, once Kyogre is defeated/caught in Marine Cave, or if the player did not arrive there fast enough, Terra Cave will reappear and relocate. It is able to appear in places as far from each other as Route 115 and Route 118, though it mostly sticks to the western side of Hoenn. In Pokémon Emerald, it is the only place where Groudon can be caught. It will only appear once the player has entered the Hall of Fame, and will disappear completely after Groudon has been either caught or defeated.
Its counterpart is Marine Cave, and the two caves cannot appear at the same time. The player must defeat, catch, or leave the Legendary Pokémon alone long enough before the other cave will appear.
A Groudon will appear in the back of the cave on the first visit. If run from, it respawns upon leaving the area.
The player standing next to the top of the map
- In Terra Cave, the player can see past the outer edges of the map, leading to a visual glitch.
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