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I've got a living natdex in Bank and a living Galar dex in Home.
Recently wanted to go back through old games to make a living dex for each generation, use a cart flasher to back up the saves of each game, then migrate forward to each gen and then reload the backup.
For mythicals I'd like to try glitches in gens 1-3 and then 4 onwards use spoofs/homebrew.