Great question. These are things I personally enjoy, but of the things I like, they generally have a) timeless or cross-culturally relevant messages that are b)

Great question. These are things I personally enjoy, but of the things I like, they generally have a) timeless or cross-culturally relevant messages that are b) relatively accessible. I mean, the OP has posed an impossible question, and I'm prepared to be wrong. But unlike other commentators I don't think that Pokemon will have the same type of timeless appeal as, say, Shakespeare. The trick / hard thing to do is to separate current popularity from "sticking power." For a good illustration of how currently popular things can fade from memory, its worth checking out old best-seller lists (e.g., https://en.wikipedia.org/wiki/Publishers_Weekly_list_of_bestselling_novels_in_the_United_States_in_the_1970s https://en.wikipedia.org/wiki/Publishers_Weekly_list_of_best...)