Quoted By:
Because Turner, and the Gamefreak staff, understand that for a design to be truly memorable it has to have a unique strong silhouette, and a mix of flattering and dorky features that lead to a creature that is more than "just cool" or whatever.
Tyranitar would be fucking boring if he were just a cool dinosaur thing instead of a fat one with a goofy face. Infernape protuding eyebrow and bulbous face make him look like something you could see a child befriend and go on an adventure with which he would not if he had a sharp and "badass" face, and Inteleon's lanky proportions are as unique as it gives him a slick flair that works well both as your goofy skinny lizard bud and as a fast and deadly combatant.
Fakemon designers never seem to understand that there has to be a balance between cool, cute and goofy. They always either go for pure cute or "cool".