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The Production Release Order is as follows (these are the Japanese Air Dates): Digimon Adventure - March 7, 1999 to March 26, 2000 [Series] Digimon Adventure Movie (Part one of Digimon: The Movie) - March 6, 19991 [Movie] Digimon Adventure: Our War Game (Part two of Digimon: The Movie) - March 4, 20001 [Movie] Digimon Adventure 02 - April 2, 2000, and ...


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In terms of the Digimon regressing: As for the portal appearing:


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Renamon is based on / heavily influenced by the Japanese kitsune, which have mystical abilities, most famously that of illusions. On top of that, Renamon has ninja-like speed, and I'd say it's a combination of both that it's using here. Blink an eye and you'll miss it. One moment it's there, the next it's gone and only leaves a fading stand-in illusion of ...


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