On which handheld system were Pokémon Gold and Silver released?

Pokémon Gold and Silver were released for the Game Boy Color.

The games are the first installments of Pokémon's second generation. They launched in Japan in 1999 and later reached Australia and North America in 2000, followed by Europe in 2001.

Gold and Silver introduced the Johto region and 100 new Pokémon, raising the total from 151 to 251. They also added features such as a day-and-night cycle, Pokémon breeding, held items, and the Dark and Steel types.

The games could also connect with the earlier generation, allowing players to travel to Kanto after completing the Johto storyline. Their success helped establish Pokémon as a continuing platform franchise rather than a one-generation phenomenon. Pokémon Crystal later served as an enhanced version of the same generation.