you can't find it because its only in the kanto region
You can get all the Pokemon in the cerulean cave where you find celebi below the cerulean cave.
There not in cerulean cave.
You can find the Cerulean Cave in the northwest corner of Cerulean City in Kanto in Pokemon LeafGreen. The cave contains the Pokemon Mewtwo.
You can find Mewtwo in the back of Cerulean Cave.
You can find mewtwo in the back of cerulean cave.
Cerulean Cave.
Cerulean cave
On Pokemon SoulSilver, to find mew two in the cerulean cave, you need to go to the bottom floor.
You can find Mewtwo in the Cerulean Cave.
It should be in the Cerulean cave
map 17
You can find ditto in cerulean cave.