A Traveler's Guide to the World of Pokémon/Hoenn/Island Cave
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Island Cave is on Route 105 in Hoenn where Regice can be found after the player has solved the mystery in the Sealed Chamber.
There is also a card based on it. It came out in the TCG Expansion EX: Hidden Legends in 2004. It's a stadium card in which when you attach an energy to a Water, Fighting or Metal Typed Pokemon and it has a special condition, then the special condition is removed.