Along with Seasons, there is a clear amount of "Energy" related refrences.
Think about this..
Pokemon Black has less cities an is not as modern as White. Its' mascot is Reshiram, which is dual Fire type. Fire was used as one of the main forms of gathering energy before electricity. Think steam engines and the invention of mass production.
Pokemon Whites mascot is Zekrom, who is electric. White is the more "modern" of the games. It has more cities that are powered by "electricity."
Victini has been called the "Nuclear" pokemon. With references to the atomic bomb and fire. It may represent the nuclear energy that is quickly becoming more popular among the world
The mascot for Gen 5 third game will be another WaterDragon
>Energy Trio: Reshiram(Fire), Zekrom(Electricity), ?????(Water). Ruler being Victini(Nuclear)