To get to this island you need the Old Sea Map event item, which could be obtained in 2005.
Faraway Island is only available in Emerald. To get to Faraway Island, you first need to have the Old Sea Map (which can be obtained by either an event in 2005, or mix records with someone who has it). You then head to the ship house in either Lilycove City or Slateport City to talk to the lady that asks you where you want to go, there should be a third option besides Lilycove (if your in Slateport and vice-versa), and the Battle Frontier. At first it seems as if you won't be able to go there, however, your old friend Mr. Briney will come out of the ship to say that he will take you to the island.
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Caves, Tunnels & 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 · Aqua Hideout · Magma Hideout · Seafloor Cavern · Cave of Origin · Sky Pillar · Victory Road · Sealed Chamber · Artisan Cave E · Desert Underpass E · Marine Cave E · Terra Cave E
|Kanto (Sevii Islands) · Johto · Hoenn · Sinnoh (Battle Zone) · Unova · Kalos · Alola|