 The first of these such items was the GS Ball in "Crystal", which was distributed to players in Japan through the mobile phone connector, allowing them to encounter Celebi.Like Legendary Pokémon, Mythical Pokémon are powerful and difficult to catch, are usually not part of an evolutionary line (with the exception of Meltan), and cannot breed (with the exception of Manaphy).Shiny Pokémon were first introduced in "Gold" and "Silver" as a way to demonstrate the new color capabilities of the Game Boy Color system.