Things You'll Need
Instructions
Insert a copy of "Pokemon Blue," "Pokemon Red" or "Pokemon Yellow" with Mewtwo captured into the Nintendo 64 Transfer Pak.
Slide the Transfer Pak into the bottom of the first player controller on the Nintendo 64. Insert "Pokemon Stadium 2" into the Nintendo 64 and power on the console.
Press "Start" at the main menu of the game. Press "A" when prompted to have the game detect your Transfer Pack.
Highlight "White City" and press "A." Scroll to "Pokemon Lab" on the left side of the screen and press "A." Press "A" again to select your inserted "Pokemon" Game Boy game.
Scroll to the computer on the far right side of the lab and press "A." Highlight and press "A" to access the "List" option at the top of the screen.
Highlight "GB Boxes" if Mewtwo is not in your party on the Game Boy game or "Party" if it is. Press "A" to open the list of available Pokemon.
Scroll to Mewtwo and press "A." Select "Move" from the available options. Highlight "N64 Box" and press "A" to confirm. Mewtwo will be moved to the Nintendo 64 game and available for use.