This episode was really painful to watch with the jarring change in animation styles. It doesn't go back to (somewhat) normal until the very end of the episode, which was way too late for me. Everyone has fish lips in this, and the worst part was that this episode seriously felt like a filler... as if that's needed for an anime series like this that practically feels like a filler or a parody of other mecha anime. I think overall, Aquarion is just okay and entertaining at times, but this episode was definitely not.
I'm assuming that the key animators were MIA for this episode, so they got all the in-between animators to do everything.