I am trying to create a MasterDex, the complete 1000+ Pokémon at this current time in a single storage. Unfortunately all the games have a number of Pokémon that are not valid or not transferable. I understand the use of the PKM database and have a large assortment of files from each game and each generation. But they are all separate or have duplicate Pokémon species within multiple regional dexs. I don't not want a sperate save/file for each dex or generation. I would like a true Master dex, like the list seen on https://pokemondb.net/pokedex/all. Something accessible in PKHeX that would or would not count as a game save. The PKM is great, but it shows Pokémon that are obtainable in that game not all Pokémon in every gen or pk file. I am not trying to edit a game save, but built a dex which I can store one of every species in existence.
Pokémon HOME has something similar to what I am trying to make, but still breaks the dex down into multiple groups not a single master dex.
I may have a lack of information on this, as to if its possible or already done. So forgive me for any misunderstandings or mistakes.