You need to beat the Pokemon the Elite Four and get 60 Pokemon then go back to Verilion City and go all the way down to the Seagallop ferry and beat the 4 5 6 and 7 islands. Then go back to Elite Four beat it again then go to Cerulean City and that person will move that is in front of that cave don't use the master ball on Mewtwo because if you got charmander as your starter you can caught Sweetcoon if you started with squartle you can caught Rikaue if you started with balbasaur you can caught Entai all three in the wild.
mewtwo in crulean cave after you beat the elite 4. p.s. i don't know how to spell crulean so its the town misty is the gym leader
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.
Diglett cave
in cerulean cave.
How to get to lost cave in leaf green??
that would depend on which cave, for there are many caves in leafgreen.
Altering cave is on 5 or 6 island.
There not in cerulean cave.
Cerulean cave
back of cerulean cave
on four island