My guess is that the first DLC wave will also involve Area Zero with maybe the time machine reactivating somehow and all sorts of Fossil Pokémon escape through the time portal that is created with only the Galar Fossils not being included since they aren’t natural creatures but rather Frankenstein like creations.
Its possible though they could also go the old fashioned way and just have it possible to find and restore the fossils in-game via a DLC area given that part of area zero would likely be underground we might just find the fossils on the ground post dlc. You could even have a Cara Liss (or if not her a fan/Relative/AI ) working there so they could include the Galar Fossils should they desire to. Remember at least some of the regular fossils may not look the the way we see them in the past if the dex is to be believed. They've stated that at least with Tyrantrum "complete restoration is impossible, allowing room for theories that its entire body was once covered in a feather-like coat" in the Ultrasun Dex and similar indications that Aerodactyl that it looked more like mega Aerodactyl (even if I don't care for that particular idea). If it was via time portals they might just imply the time portals go to some point in time but its not entirely clear when (thus leaving it possible they only come from the recent past) and thus these portals could just go to any point in the past (but variable points in space) where these had been restored already.
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