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Zoomies think the usage of brown paper and the word "Legends" seems to point to it occuring in a timeframe before the current modern times of the series, rather than the visualization of the city, the fashion sense of NPCs in said city, the existence of Lumiose Tower in all its modern glory, the futuristic design of the Z-A logo, the word "redevelopment" stressed in many parts of the trailer, and the fact that "Legends" doesn't explicitly means the past in English dictionaries.