There are now Mewtwos: one male, one female.

Visit the Official H2G2 Pokémon League! Please!

Okay, so you're wondering what the difference between male and female Mewtwo are, because you don't actually see the people here. Well, the only obvious difference I can think of at the moment is the fact that -- you know about that "armor" thing on the male's chest? Well, instead of looking like two squares on the male, the female has a sideways D (round part down). Nuff said?

No. The twins, as promised-but-not-promised, are arrived. DOB: 27/10/2000. One is male, and one is female. But ... what are they? They have the "ears" and tail of a Mewtwo, but everything else except vocabulary is that of a Mew. They have a "wun"-sounding syllable, we know. So, Ketsar (the male) and Poxlu (the female) are not quite Mew, and not quite Two, so they are The MewOne Twins.