It's located nearby Cerulean City to reach there go to route 24 use Surf then follow the water down until you reach the cave.
No
Cerulean Cave
Cerulean Cave
Cerulean cave located near cerulean city.
Cerulean cave
mewtwo is in cerulean cave
inside cerulean cave near cerulean city.
It is in Cerulean Cave. It is on the bottom floor of the cave! :P
After you beat the Elite Four.
The Cerulean Cave
You can get Mewtwo in the Cerulean Cave.
You can find Mewtwo in the Cerulean Cave.