Pokémon Stadium 2 features all 251 Pokémon from the first and second generations. The Nintendo 64 strategy game brought the original Game Boy and Game Boy Color rosters into fully 3D battles.
The game was released in Japan in 2000 and worldwide in 2001. It supports Pokémon from Pokémon Red, Blue, Yellow, Gold, Silver, and Crystal through the Transfer Pak accessory. Players could use compatible Pokémon trained in those handheld games during Nintendo 64 battles.
The total of 251 reflects the first two generations: 151 species from Generation I and 100 added in Generation II. Later Pokémon generations were not included. The game was re-released through Nintendo Classics in 2023, although the modern version cannot use the original Transfer Pak feature.