Well here is what I say it is the same thing as one of the things I say to disprove evolution in the real world. Just because two or more creatures share some resemblance does not mean they are the same creature. Take the supposed Horse evolutions in the real world they never evolved into the horse as they were found in differant parts of the earth, all have differant amounts of ribs, and in the wrong strata. So I it is like that 2 differant pokemon that look similar, with differant powers, in differant regions.
Please note that I am not trying to shove my creationist beliefs in your face I am just useing it to answer a question