"Generation II" was the second Generation of the Pokémon series. Generation II introduced 100 Pokémon, labelled 152 through 251 in the National Poké Dex.
Generation II consists of three games: Pokémon Gold Silver, and Crystal Versions. The first of these games released were Pokémon Gold and Silver Versions, which were released in Japan in 1999. Pokémon Crystal Version, which has become the first traditional "third version", was released in Japan in 2000. A sequel to the 1999 game Pokémon Stadium was also released as part of this generation.
Generation II introduces various changes into the series. Two new types (dark and steel), a new region, Pokémon genders, Shiny Pokémon, the ability to choose between a male and female playable character, an active day and night cycle, and the ability for Pokémon to hold items are just some examples of the changes made to the previous generation of games.