Have never played the game
You need all 16 badges
You Need Lots Of Badges
I am in the cave and can't find mewtwo anywhere what part of cave is mewtwo in
Once youve collected all the badges in the kanto, region,, go back to cerulean city and to the cave previously guarded. It is now open to be explored and mewtwo is inside
As in FireRed and LeafGreen, after you have earned all the Kanto badges, you will gain access to the Cerulean Cave. Deep within the cave, like in FireRed and LeafGreen, you will find Mewtwo. It is at level 70, so be sure to bring your strongest Poke-mon.