>>33350948Spoilers;
Necrozma's Pure Light form is actually evil (think Kremzeek, it loves chaos) it was sealed away by an unknown Pokemon that will be introduced in the Switch game.
Necrozma and the unknown Pokemon will be the legendaries of the Switch game - one representing evil light the other representing good darkness - a sort of Yin Yang playing more on the original definition where Yang (light) is bad and Ying (black) is good
> Yin is characterized as slow, soft, yielding, diffuse, cold, wet, and passive; and is associated with water, earth, the moon, femininity, and nighttime.> Yang, by contrast, is fast, hard, solid, focused, hot, dry, and active; and is associated with fire, sky, the sun, masculinity and daytime. 