Um no we already have information- LGPE is Gen7
- Melmetal and evo is the last Gen7 Pokemon
- SwSh's regional Dex is 001 - 4??
So far we don't know if he is in or not, all pokemon after 400 are not obtainable for the leaker, because he only has a Switch Lite and no way to dump the game for a datamine.
Also we don't know yet how many pokemon are in or not, because of what happend in USUM, pokemon without a regional dex number.
Just wait until we can datamine this game.
Um no we already have information
https://www.resetera.com/threads/pokémon-sword-and-shield-spoiler-leaks-and-datamine-thread-discussion-guidelines-in-op.150651/#lg=_xfUid-2-1572876600&slide=0
https://www.resetera.com/threads/open-spoiler-now-that-the-entire-sword-shield-pokédex-leaked-lets-mourn-the-pokémon-that-got-thanos-snapped-by-game-freak-see-staff-post.151080/ (last one contains previous pokemon/ tells which ones are missing.
Which melmeltal, and Meltan are cut.
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And further proof is what happened to the original tweet and some of the images. It was taken down by Nintendo. Aka, it was true.