FusionDex

Shellfing drift through the ocean, either riding currents or releasing bursts of air from their spikes to move around. If they experience sudden physical contact, they explosively release air and poisonous gas from all of their spikes.

Getting up close to a Shellfing will give you a chance to observe, through its thin skin, the toxic gases swirling inside. At night, it burrows a hole in the seafloor with its broad tongue to make a place to sleep.