>>48897756Extending this, Meltan and Melmetal are included because steel is another lacking type that was only covered by Magnemite, A-Sandshrew, and A-Diglett.
Sun and Moon were also planned to have direct compatibility with GO-- you can't really say that GO directly caused irreversible damage to the franchise would acknowledging Sun and Moon's troubled development and the way that this affected the end of Gen 6, the rest of Gen 7, and the beginning of Gen 8 which explains why Sword and Shield are so similar to Sun and Moon's haphazard design philosophies.