Feel free to further discuss this question, further elaborating on your vote.
Please note:
- It’s not entirely clear if Meltan and Melmetal are a part of Gen 7 or a part of Gen 8. Gamefreak hasn’t come out with an official statement on this; it’s not the 1st time they’ve revealed a mythical that comes before the starters of the upcoming new Gen yet still be a part of said upcoming new Gen (hint: Victini). However, given that 1)LGPE are considered Gen 7 main series games and 2) both have National Pokédex numbers 808 and 809 respectively, for the time being I consider them to be a part of Gen 7.
- I don’t anticipate Gamefreak to come out with any more new mythicals for Gen 7. I think Meltan and Melmetal are the last ones (and still debatable if they’re Gen 7 or Gen 8 Pokemon, see previous bullet point.); any new Pokemon announced from this point forward will probably be those that will be in the upcoming Gen 8 games.
- Yes, even though Meltan and Melmetal are part of the same evolutionary line, they’re still two separate mythical Pokemon.
Please note:
- It’s not entirely clear if Meltan and Melmetal are a part of Gen 7 or a part of Gen 8. Gamefreak hasn’t come out with an official statement on this; it’s not the 1st time they’ve revealed a mythical that comes before the starters of the upcoming new Gen yet still be a part of said upcoming new Gen (hint: Victini). However, given that 1)LGPE are considered Gen 7 main series games and 2) both have National Pokédex numbers 808 and 809 respectively, for the time being I consider them to be a part of Gen 7.
- I don’t anticipate Gamefreak to come out with any more new mythicals for Gen 7. I think Meltan and Melmetal are the last ones (and still debatable if they’re Gen 7 or Gen 8 Pokemon, see previous bullet point.); any new Pokemon announced from this point forward will probably be those that will be in the upcoming Gen 8 games.
- Yes, even though Meltan and Melmetal are part of the same evolutionary line, they’re still two separate mythical Pokemon.