Ok I looked up the gen 3 animations for every kick move, which are jump kick, high jump kick, double kick, stomp, mega kick, triple kick, low kick, and blaze kick. If any of the animations had a footprint on them it was a dog footprint. So this is a pokedex entries footprint. If somebody identifies whos footprint it is I will hide this answer but because the question was asked a month ago and hasn't gotten any feedback I don't think anybody is trying to figure it out. There is also a chance that it is just an unused file.