Vaporfing's body regularly puts out a copious amount of bubbles from its many pores. Though harmless and even aesthetically pleasing to some, the bubbles release a pungent scent when popped.
Getting up close to a Vaporfing will give you a chance to observe, through its thin skin, the toxic gases swirling inside. Vaporfing underwent a spontaneous mutation and grew fins and gills that allow them to live underwater.