Hideki Sonoda, the scriptwriter of the movie, was asked about the creation of the second Mewtwo. Here's the translation courtesy of FANG-TAN:
This speaks volumes. Tomorin asked a completely acceptable question and was scolded for being rude, with no answer being given.@tomorin0326: If this different individual is a different individual, who created it and how?
@sonodahideki: Bothersome. Use ki. (ki, mood, spirit, energy, air)
@tomorin0326: To be frank, I did not think - sorry! But as a Mewtwo fan, I'm just curious/anxious! Because I like Mewtwo!
@sonodahideki: Compliments are fine. Praise.