Cerulean Cave.
back of cerulean cave
Yes,its level is 70.
cant you have to either trade from pokemon leafgreen or fire red
No. It's a cheat. Mewto, yes.
the best Pokemon are mewto and the rarest Pokemon ever mew.
You cannot see it in the wild in Pokemon Diamond; you have to transfer it from FireRed/LeafGreen.
Play another game or try collected all pokemon (mewto)
you just wander around and you find MewTo
you cant
you need to fix that professors machine on the sevii islands (the seven islands) the ones that you unlock after the league
After you beat the elite four for the first time, you will gain access to the Cerulean Cave. Inside you will find Mewtwo. He is very high level at 70 so come prepared.
Mewto is in a cave that's guarded by that man. you can't go in until you beat the elite four and get all your badges. The cave is in that city or town who's name starts with a C. sorry.