You need to give a ruby and a Sapphire to a scientist dude towards the end of the game. Once you finish, the person blocking the door is gone. If you make it all the way through the Cerulian Cave, you will find Mewtwo lvl. 70.
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You have to get the National Pokédex by catching at least 60 different types of Pokémon and talking to Professor Oak, and then deliver the Ruby and Sapphire stones to Celio on Island One. You can then enter Cerulean Cave.
go to cerulean city (in kanto region)go by the brige and surf on the water to get to a cave you have to earn all you gym badges to enter and if you search enough you will find meowth at level 80. if your trying to catch meowth a ultra pokeball wont work
Well after you beat it the second cave go to cerulean city go through the bridge in the north go left and down till u can surf. surf down and left when you can and there will be someone blocking it. If ou beat him 1 time it wont work. if second he should let you in. then in some place that is there should be Mewtwo. Well ive only telled you how to get mewtwo. well the answer to your question you unlock mewtwo.
if u killed giratina in the distortion world here is how u get it in turn back cave ]]]]]]]]]]]]] first you need to beat Cynthia then she wont block the entrace to turnnback cave then u have to see 4 pillars in turn back cave then giratina will be there HOPE THIS HELPS!!!!!
you cant. there isnt any flint and steel, or lava wont set anything on fire