In Ceurelean City Cave there is Mewtwo.
Cerulean Cave
Cerulean Cave.
In cerulean cave
Cerulean Cave
Cerulean cave
Southeast from the middle of the cave
Yes in the Cerulean Cave.
You can access Cerulean Cave in SoulSilver after you get all 16 gym badges (Johto and Kanto).
It is found in the Cerulean Cave in Kanto.
it is in cerulean cave at level 70
Route 7, Cerulean Cave
There is one in the Cerulean Cave in Kanto.