Game Boy, Game Boy Color, and Game Boy Advance systems require cables to trade, so here are the types of cables you'll need to trade between Generation I and Generation II games on various hardware. Japanese games are not compatible with non-Japanese games, and will corrupt your save data if you attempt to trade between the two. Players can then 'trade through time' as the Time Capsule presents the Generation II game as if it were a Generation I game to your copy of Red, Blue, or Yellow.

Players must also have received the Pokédex from Professor Oak in order to trade from Pokémon Red, Blue, or Yellow. The Time Capsule machine is located on the upper floor of the Pokémon Center in Pokémon Gold, Silver, and Crystal, and must be unlocked by meeting Bill in Ecruteak City. While there's no explicit transfer area to bring all of your Pokémon from Red, Blue, and Yellow to Gold, Silver and Crystal, players can still trade between both generations using the Time Capsule feature. How to transfer between Generations I and II Virtual Console versions of Generations I and II were later brought to the Nintendo 3DS family of systems, which made it possible to transfer Pokémon caught in those versions to modern consoles.

However, you may still transfer Pokémon between the physical copies of these two generations. Because of the unique way in which stats are calculated, alongside the inability to connect the Game Boy (Color) with the Game Boy Advance, it is impossible to transfer Pokémon from physical copies of Generations I and II past the Game Boy Color, at least not by any official means. The Game Boy and Game Boy Color are home to Pokémon Red, Blue, Yellow, Gold, Silver, and Crystal, with Pokémon Green being released in Japan only.

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