Mewtwo
To catch mewtwo beat the elite four and catch 60 Pokemon then go and see professor oak and he will give you the national pokedex then go to island 1 and talk to celio and he will tell you to get the sapphire. When you get it and give it to him he will give you the rainbow pass which gives you access to all 7 islands. Then go and get the ruby which is in dotted hole but when you find it a guy will steal it and give you the second password to the team rocket warehouse. Find your way through the warehouse and fight the guy who stole the stone. When you beat him he will give it to you and then give it to celio. Then go to cerelean cave and the man who was standing in front of the cave will be gone. Then find your way through the cave and you will find a rock with surf to that rock and you will see mewtwo. Dont use your masterball, save it for one of the legendary dogs.
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