Skycaller

The Skycaller is a strange creature that randomly appears above ground. Its loud, resonating howl has the curious ability to change the weather, whether (no pun intended) it be helpful or harmful. It resembles a small, ovoid organism coated in thick white fur, with two blue eyes, long legs and a pair of clawed flippers. It is docile and will not attack the Pikmin, and will flee if disturbed too much. It will only use its weather-howl if you are nearby.

Special weather conditions
Aside from the standard weather types, there are some special ones that are caused only by this creature.

Firestorm
The sky becomes bright orange, and small embers will fall from the sky. This weather goes away after a while.

Shadow Fog
A black fog enshrouds the area, making only a small area around you visible. Enemies also become more aggressive during this weather condition. You have to kill the Skycaller to end this weather effect.

Uberstorm
Wogpoles will fall from the sky for a short amount of time, with a rare chance of any adult Wollywog species dropping.

Blizzard
A white fog enshrouds the area, and heavy winds and snow will make it hard to walk. There's a small chance that some non-Cyan Pikmin will freeze. This weather goes away after a while.