Gold, Silver & Crystal Pokédex

Pokémon Gold, Silver & Crystal introduced 100 new Pokémon in the Johto region, and contains all Pokémon from Kanto as well. The Johto Pokédex puts the new starters at the beginning and groups evolutions from the two generations together (such as Zubat/Golbat/Crobat).

See also: the Gold/Silver Pokémon stats page which shows only the new Pokémon introduced this generation.