 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.