By the standards of dragon pokemon, newborn Goomy are small and weak, traits which in many species of young pokemon reduce their chances of surviving to adulthood. Dragon pokemon in particular have extremely long lifespans, including long childhoods, which is why most are either born powerful or raised in isolated locations free of predators such as Johto's Dragon Den. Goomy protect themselves in a different way; their bodies are so gooey and slimy that, whatever their nutritional value, those who try to eat one will typically find their claws and fangs covered in a sticky goo and rendered useless.
In this era, predatory pokemon still exist, but wild Goomy have also frustrated many humans with the dangers they pose to their vehicles. Goomy are too small to be easily noticed by the operators of mechanical equipment, and have had no need to develop a fear of Man. They can gum up everything from bulldozers and tanks to bicycles and automobiles, rendering wheels of every type stalled until the Goomy is scared off or otherwise removed – and slowed by their goo for some time afterwards.
Goomy numbers, like those of most dragons, were never all that high, and the efforts by humans to extirpate these pokemon from their roads, trails, and settlements would swiftly make them an endangered species were any of them remotely effective. Fortunately for biodiversity, and unfortunately for the cause of swift transportation and construction, humans have yet to devise a way to do anything more than mildly annoy these proud pokemon. Those who travel through Goomy lands would be wise to carry poke balls, for they are both the cheapest and most effective way to deal with a Goomy clogging up your vehicle's wheels; they can be released at the next city's pokemon center.