Pokémon Box Ruby & Sapphire is a storage utility for GameCube, published by Nintendo. It was released in Japan on May 30, 2003 and in Europe on May 14, 2004. Here is its spec sheet.

The cover art.
Japanese titlePokémon Box Ruby & Sapphire
PlatformGameCube
Japan releaseMay 30, 2003
Europe releaseMay 14, 2004
North America releaseJuly 12, 2004
Australia releaseJuly 16, 2004
PublisherNintendo
GenreManagement utility
Players1
Storage1,500 Pokémon, 25 Boxes of 60 slots
Compatible gamesRuby, Sapphire, Emerald, FireRed, LeafGreen
AccessoryGameCube–Game Boy Advance cable

How it works

The cable links the GameCube to the Game Boy Advance so you can deposit or withdraw Pokémon without trading. Juliette, creator of the mass storage system, is the sister of Lanette, who designed the storage system in Ruby, Sapphire and Emerald.

The Pokémon Colosseum Mega Pak

In Europe, Pokémon Box was offered in a special pack, the Pokémon Colosseum Mega Pak. It contained a black GameCube, a black controller, a 251-block memory card, Pokémon Colosseum and the GameCube–Game Boy Advance cable.

The French manual has the reference IM-DOL-GPXP-FRA.