The same as to get it in leafgreen - You must:
1. Defeat the Pokemon League
2. You have to have caught at lest 60 different kinds of Pokemon.
3. You have to have given Celio the Sapphire and Ruby
Then you have to go to Cerulean City and go through Cerulean Cave. At the end is ***MEWTWO!*** You can capture it in an Ultra Ball but it is really hard if you haven't used your Masterball you might want to use that. It is at Lv. 70 and it knows Swift, Safegaurd, Psychic and Recover. It has high HP, Attack, Defense and Speed. Have a good time!
Mewtwo, yes, if you have a FireRed or LeafGreen with Mewtwo.
Yes it is in a cave.
use a master ball on it
To catch Mewtwo in LeafGreen or FireRed no. To migrate Mewtwo from LeafGreen or FireRed to Diamond/Pearl/Platinum yes you have to have it in Diamond/Pearl/Platinum.
u cant get mewtwo in platinum. But, you can get him on: Firered, Leafgreen, ect.
Face the Pokemon League again
I believe you face the Elite 4 again.
Mewtwo.
Mewtwo!
Mewtwo is found in cerulean cave.
no, firered or leafgreen
Mewtwo, yes, if you have a FireRed or LeafGreen with Mewtwo.
You need to beat the Pokemon league. Prephare to face the leagendary Pokemon mewtwo in that cave. I recommend ultra balls.
Catch 'em all
No migrate him from firered or leafgreen to get him.
Yes it is in a cave.
He is at the end of cerulean cave.