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As far as what can be found in Sinnoh
>Cranidos & Shieldon: Described as living in jungle environments (so definitely not cold Sinnoh), and fossil restoration technology likely hadn't been invented yet
>Trash Wormadam: No metal buildings, everything's wood
>Rotom: No electricital appliances, all the Pokeballs run on steam power
>Magnemite: Looks really modern, might be hard to justify
>Porygon: No internet
Everything else in the Sinnoh regional dex should be good though.
