Boosts the power of this Pokemon's special moves at night. This becomes even more powerful in a dark overcast, at the cost of HP per turn.

Gives a 1.2x increase to Special move Power at Night, which can be increased to 1.5x if it is a Dark Overcast. It does not have to be Night for the Dark Overcast power increase to activate, and the HP loss is similar to Solar Power (1/8 a turn).