One of the wireless adapter's greatest uses is in "Pokémon FireRed", "LeafGreen", and "Emerald". While all three still support the Game Boy Advance Game Link Cable, up to thirty-nine wireless adapter-connected players can convene in a virtual in-game lobby called the "Union Room" for battles and trades. The wireless adapter is also used in Pokémon games to download special data via the Mystery Gift option at various Pokémon-related events. Besides the Union Room in certain "Pokémon" versions, the wireless adapter only supports up to five players.