They say that the areas where Clefairy gather together become enveloped in a magnetic field that is abnormal. The ability Magic Guard used to be exclusive to their line until Gen V and could be a reference to their overall mysteriously magical nature.

Clefairy rest best after a long night of playing under the moonbeams. It's hard to find them in the wild, but its even harder to find them snoozing. It's easier to spot them after a full moon and it is said those who see it using metronome while sleeping (an unusual sight) will find happiness.