I feel like there's way more evidence for Sinnoh than Unova though. Since Shaymin isn't the only mythical to have been jipped recently. Arceus, Manaphy, and Phione were also all not included in Pokemon GO or SwSh, and other than Deoxys they were the only mythicals to be excluded in SwSh. Plus the fact that none of the Sinnoh starters made the cut, the croagunk wooden statue in Hop's room, etc.