Ivysaur

As Ivysaur, the pokemon gets just a tiny bit bigger, taller and more menacing, with bigger fangs and a look of raw determination as its plant begins to sprout. You ever wonder what these things might look like on the inside? Where does the plant aspect end and the animal aspect really begin? Are there roots throughout Ivysaur's skeleton and entrails? Does Ivysaur have both animal and plant cells?

At this point, the "horns" turn into more overt mammalian "ears." What IS this creature's taxonomy supposed to be? Frog? Reptile? Reptomammal? Actually, reptomammal sounds about right. This is clearly something from the age of Dimetrodon.