User blog comment:GlitterInformer/Smile Pretty Cure!/Glitter Force SDC: Episode 1/@comment-31772797-20181120211457/@comment-37117761-20181225010611

Is Pokemon the anime you're talking about?

The Pokemon shock incident is probably what led to the darkening. Surprisingly, though, a good amount of Cure Peace's lightning is left untouched, and Cure March's wind is the most likely to be darkened.