You can only get inside when you fight finish the Pokemon league .
You can find the Cerulean Cave in the northwest corner of Cerulean City in Kanto in Pokemon LeafGreen. The cave contains the Pokemon Mewtwo.
cerulean cave works but its strong.
There not in cerulean cave.
in cerulean cave.
back of cerulean cave
Cerulean cave
Go to Cerulean Cave.
Cerulean Cave.
He is at the end of cerulean cave.
In Cerulean cave in Pokemon firered and leafgreen
At the end of Cerulean Cave.
Mewtwo is found in cerulean cave.