I can't say that I believe Pokemon Company would ever let it go that way.
My reasoning is this: There are religions that hold a personal belief that gender (AKA the simple fact of being male or female) is a hinderance to spiritual growth and power. Their "Holy People" seek to rid themselves of any hint or vestage of gender in their quest for "enlightenment". And there is strong endictation that pokemon company has taken that route with their most powerful pokemon. That seems to be the most likely reason why they have declared many of their pokemon to be without gender. With the exceptions of Latios and Latias (if they are officially "Legendary") all legendary all ultrapowerful pokemon in the game are officially genderless.
While I personally find both the designation and the apparent reasoning behind it silly, they do have the legal right to see it that way.
Nice picture and good luck.

Since mewtwo was a manmade pokemon from cloning they could easily make mewtwo any gender, but i understand what the pokemon company intended since mewtwo was the most powerful pokemon at the time. thanks for the comment! i never knew the reason for genderless pokemon