FusionDex

Vaporduck are prone to painful headaches, bathing themselves in water to try to soothe themselves. If there is no pond nearby when they're struck with a headache, they spray out a stream of water, sticking their head in it as quickly as they can.

When its headache intensifies, it starts using strange powers. Vaporduck underwent a spontaneous mutation and grew fins and gills that allow them to live underwater.