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Pretty much any “synthetic/man-made” Pokémon in the series except for Claydol, Magearna and the other magical ones that will probably be in it. Magnemite, Rotom, and other object/object possessing mons might be in the game, but with “old Sinnohian” forms.
Speaking of Magearna, would Legends possibly be the first game where you could get Magearna-Original without events, along with the original form of Genesect and every non-rock/non-extinct versions of the fossil mons?