>>46929880Absolutely, unequivocally based color scheme and distribution of that color. It also has one of the most successful examples of Sugimori philosophy of not making a Pokémon embody too much of one trait, and encouraging himself and others to add in a visual element that contrasts the rest of the design. In this case, Fug just having hum lining and very few teeth. Makes the design way more memorable in a way that actually makes it even cooler how it still exudes power despite lacking a row of teeth.
The anime probably helped its popularity too. It's one of those Pokémon whose most iconic portrayal was as a destructive force of nature. He was basically a classic kaiju in Destiny Deoxys.