You need the Master *** Rank.
technically yes, but you need a mystery part to be able to
To Catch Mewtwo You Need A Action Replay.
You must have a Secret Slab/Mystery Part. He is in Dark Crater, 10F.
No You don't.
You'll need to trade for it.
you need to do the Pokemon league
You can't you need to trade him from Pokemon red,yellow or blue.
you must go to schimmer desert 20b and you need to be the Pokemon were you play the story with battle him and you get a special ting from seven treasures and hy loin you
You need to have mewtwo to get it
yes
First you need to battle palkia. After you will be asked to enter his nightmare. That's where you encounter darkrai. Then he tells you to battle him in the dark crater. Last in the final floor you battle darkrai. As simple as that.
Mewtwo isn't unlockable in Pokemon Stadium 2. You will need to register it from either Red, Blue, Yellow, Gold, Silver, or Crystal version.