It is in cereulan city. You can only go there before you beat the elite 4 and bring the ruby and sapphire to celio. You can catch mewtwo there.
Yes it is in a cave.
Cerulean cave
lost cave
In icefall cave.
in cerulein cave very back
You can find the Cerulean Cave in the northwest corner of Cerulean City in Kanto in Pokemon LeafGreen. The cave contains the Pokemon Mewtwo.
There is no awakening cave.
in cerulean cave.
Diglett cave
How to get to lost cave in leaf green??
Altering cave is on 5 or 6 island.
that would depend on which cave, for there are many caves in leafgreen.
There not in cerulean cave.
Cerulean Cave.
He is at the end of cerulean cave.
lost cave
It is in Five Island