>>724833583
They were probably trying to look "cooler" to the young boys. Boys had the cool monsters like Golem and Naga, girls had the cute monsters like Mocchi and Pixie. Dino was one of the goofy looking monsters, which I guess is fine, except that it's one of the first you'll see. I guess Tecmo thought that it might drive boys away so they replaced it with a much "cooler" and edgier design, the Zuum.