Mewtwo is the cloned version of Mew. It is known to be the most powerful pokemon in the game. It does not spawn naturally. The only way to get Mewtwo is cloning a Mew with a Cloning Machine. Mewtwo will come out of the machine at level 80.
"A pokemon created by recombining Mew's genes. It's said to have the most savage heart among pokemon."
Mewtwo is not an evolved form and it does not evolve. It is the cloned version of Mew.
Mewtwo can not be rode on and does not fly.