you need all the 16 gym badges and then go through the cave
mewtwo
Yes, Mewtwo, Latios and Latias will be in HeartGold and SoulSilver.
Cerulean cave
yes, in the cerulian cave
A level 70 mewtwo.
in curelen cave you get mewtwo
in cerulean cave at the end
You can't catch Mewtwo in Pokemon Diamond and pearl and also platinum. But you can catch Mewtwo in heartgold and soul silver
You can't, Mewtwo is not available in Platinum.
you dont you battle mewtwo and get out
you dont, its not in HeartGold or SoulSilver, Ho-oh (HeartGold) or Lugia (SoulSilver) take their place. You can also get mewtwo
You can only get it in Pokemon chaos black version. Its is where mewtwo is instead of mewtwo.