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theres no such Pokemon their are just tricking you there is no such Pokemon and Pokemon chaos black is a fake
chargestone cave if your talking bout pokemon black
NO
a cave
finish the Pokemon league and go to the spring path you will see a new cave go in the cave it changes so just wander
Go to cerulean cave and a man will ask you questions the answers must be Yes no no Yes and Me (your name) he will laugh and you will now find mewthree as your next wild pokemon.
You can only get inside when you fight finish the Pokemon league .
after you finish the game go to volcano cave - magmortar will be there
go to the cave that only the Pokemon master can come in to. in their u find mewtwo
You can get it in Challenger's cave
mistralton cave
he is in the giant chasm