you have to defeat the elite four and the champion and then you have to get the national poke dex
There's nothing left for you to do.
Mewtwo isn't unlockable in Pokemon Stadium 2. You will need to register it from either Red, Blue, Yellow, Gold, Silver, or Crystal version.
You can't, Mewtwo is not available in Platinum.
You can only get it in Pokemon chaos black version. Its is where mewtwo is instead of mewtwo.
articuno zapdos moltres and mewtwo but you can also find mew, without gameshark or anything.
Mewtwo can only be utilized from a Red, Blue, or Yellow gamepak.
mirgrate or trade from anothher version
if can go to cerulean cave you can
In Victory Road
The Pokemon that are in Pokemon blue are at least the first 149 Pokemon in the pokedex. I'm not sure about Mewtwo or Mew though
you get mewtwo in the cave next to cerulean c:
just beat the elite four