WOW! I'm surprised I'll be the first to pull this one out but Porygon! As one of the only two man made Pokemon (I haven't kept up well with the recent generations, might be more), he just seems cool to me and his conversion ability is just so unique! Honestly, I don't use it but in my head, where I play out my own Pokemon stories they can have more then four abilities. I actually love his entire line, and always make an effort to put him in my team.