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Difficulty hacks will eventually come out so this isn't as disgusting as it otherwise would be. Still incredibly sad how third parties need to fix the messes GF shits out.
Also, we don't know if the National Dex is completely absent in terms of data or they're simply uncatchable. Gamefreak loves future-proofing, (the walking animations in SM for example) it's a real possibility for an edited SS to save this generation. I wouldn't be surprised if additional mons were hidden away for the DP remakes.