Video Game
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Pokémon Silver
Release Date: October 15, 2000

Back when there were 250 to 251 pokémon, you needed Gold and Silver to catch all the G/S/C pokémon not inclusing Celebi and Mew.

Here are the pokémon you cannot catch in Gold, but you can catch in Silver:

Ekans
Arbok
Vulpix
Ninetales
Meowth
Persian
Ledyba
Ledian
Delibird
Skarmory
Phanpy
Donphan

Celebi

Starting Pokémon:

Cyndaquil (Fire Type)
Totodile (Water Type)
Chikorita (Grass/Plant Type)

(You have to pick one).

Total Number of Badges:

16