The Island Cave (Japanese: こじまのよこあなIslet Cave) is a location in Hoenn on a small island on Route 105. In the inner chamber, Regice can be found at level 40; it will have the moveset Icy Wind, Curse, Superpower, and AncientPower.
To get to Regice, the Sealed Chamber's puzzle must be completed. After this has happened, the ruins can be accessed.
To open the door in Pokémon Ruby and Sapphire, once in the lobby area, the player must read the Braille inside and simply stand in the same place for two minutes without touching the game. The door will still open even if the game's battery has run dry and time-based events no longer occur. The Braille reads: "Stop and wait. Wait for time to pass twice."
To open the door in Pokémon Emerald, once in the lobby area, the player must read the Braille inside, then make a counterclockwise lap of the chamber, sticking close to the walls. The Braille reads: "Stay close to the wall. Run around one lap."
A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here.