I looked at the picture again and I know there were some doubts about this being Gliscor and some have said that maybe Drapion fired an X-Scissor. Well looking at the X, the angles make it look like it points towards the direction of Drapion. Meaning, the X-Scissor is coming from Ash's side of the field. What pokemon can fly and have an X-Scissor? Gliscor!