FusionDex

Its muscles expand and tense the more electricity it has stored within itself. The long, white hair of a Amphapert turns as dark as a storm cloud when it exerts itself, which often occurs when it prepares to protect its nest.

If it senses the approach of a storm and a tidal wave, it protects its seaside nest by piling up boulders. It gives off so much light that it can be seen even from space.