FusionDex

Wild Vileran rest in burrows with their rear flowers aimed outward, serving as camouflage. Rangers keep track of any they find, because these Pokémon can sniff out, and will eat, poisonous plants. This diet, however, causes their horns to be toxic.

Its highly toxic barbs are thought to have developed as protection for this small-bodied Pokémon. In seasons when it produces more pollen, the air around a Vileran turns yellow with the powder as it walks.