FusionDex

Once Growlsect finds a rotting tree to feed on, it becomes incredibly territorial. If it smells an unfamiliar smell, it will try to frighten off any potential intruders by running in circles around the tree and barking loudly.

Growlsect are known to infest the roots of large trees en masse and drain nutrients. Its superb sense of smell ensures that this Pokémon won't forget any scent, no matter what.