>>38153635>>38153645>>38153822>>38155087Highly unlikely. Mythicals are not free handouts and they don't even count towards dex completion/getting the shiny charm. You don't need them unless you personally want them.
After Go inevitably dies the only way you'll be able to get Meltan and Melmetal (legally) will be through events.
Gamefreak wants your money, that's why they put Mew in a controller.
