>>50675998They wanted to fit in every Pokemon that was introduced in Sinnoh, which means that they needed to come up with something for Porygon and Magnemite due to their final evolutions. Fortunately they were able to use the idea of how you originally got there as an explanation.
It's sort of like fossils as well, as fossils are from Pokemon that existed thousands of years ago and not merely 150 years ago, so that's why they're also in space-time distortions. It's not like the technology existed yet to revive Pokemon from a fossil.
This also sort of spoils the discovery of reviving Pokemon from fossils however, unless historically no trainer ever went into a space-time distortion during the Hisui era to catch Shieldon/Cranidos. If anything, this is a bigger plothole than Porygon/Magnemite.
