No, but there is a alternate color green Mewtwo.
mewtoo and dialga
You can't.
The rare Pokemon in the leafgreen and firered games are Mewtoo one of the legendary dogs from silver and gold depending on who you start with, moltres zapdos and articuno.
Cerulean cave located near cerulean city.
you can find groudon, mew, mewtoo, rayquaza, kyogre...
u have to finsh game and go to Diglet cave at the end
mewtoo latias darkrai latios dialga palkia
yes. he is on the 3rd floor and is lvl 70. bring a lot of repels!!
hes not mewtoo and rushiram is better
you find the sihny ston in mewtoo's cave
The secret master ball is in mewtoo's lair. Look around with the item finder for it.
in ss, he is somewhere in cerulian cave... but if you want to go there,you have to get ALL of the kanto badges.