Mystery Gift, a means by which players can receive items from other people, was introduced in "Pokémon Gold" and "Silver" and has appeared in every handheld "Pokémon" game since. To use Mystery Gift, the feature must first be activated in a specific way. In "Gold", "Silver", and "Crystal", if two players line up the infrared ports on their Game Boy Color units and activate Mystery Gift from the intro menu, each will receive an item. This process also sends a record of each player's party Pokémon to the other player's game for a daily event in Viridian City in which they can battle the other player's Pokémon (controlled by the computer). Players can use Mystery Gift an unlimited number of times, but only once per day for each person. In addition, a player of "Pokémon Stadium 2" with a "Gold", "Silver", or "Crystal" cartridge plugged into the Transfer Pak can use Mystery Gift with a girl in White City. A Mystery Gift can also be received by connecting with a Pocket Pikachu 2 GS. In "Ruby" and "Sapphire", Mystery Gift is replaced with Mystery Event. This feature utilizes the now defunct e-Reader accessory. Using special e-cards, the player could obtain special items such as rare Berries or the Eon Ticket. In "FireRed", "LeafGreen", and "Emerald", Mystery Gift is a means to obtain special items at Nintendo's promotional events through the use of the Wireless Adapter, which allow the player to catch otherwise unobtainable Pokémon, such as Mew and Deoxys. "Pokémon Diamond" and "Pearl" expanded Mystery Gift to include a variety of transferring options. After enabling Mystery Gift, players may obtain items via wireless or Nintendo Wi-Fi Connection, and may also transfer them to friends. Wireless connection also allows the player to transfer items from "Pokémon Battle Revolution". Currently, Mystery Gift via Nintendo WFC has only been implemented in "Pokémon Platinum" and "Pokémon HeartGold" and "SoulSilver". However, this was changed when the shiny Pichu was distributed to all version games via WFC. Also, with the creation of the Pokéwalker, in "Pokémon HeartGold" and "SoulSilver", came another way to Mystery Gift. By pressing the connect button on two Pokéwalkers and pointing them at each other, both Pokéwalkers will receive an item, which the player will receive upon connecting with his or her game. Beginning with "Pokémon X" and "Y", an option to receive Mystery Gifts by single-use serial code or password over Nintendo Network was added.