I know this isn't a datamine or confirmed leak, and I can't find the original post or the screenshot anywhere but in this video, but apparently a rumored pokedex leak has included all of the Pokémon revealed so far, even Pokémon revealed after the leak was posted in May:
Feel free to skip past the beginning because it's just unnecessary introductory stuff. aDrive doesn't realize this in the video, but there are 200+ Pokémon on the list, and there are many legendaries and other Pokémon that were revealed for the Crown Tundra included, so this list probably includes both the IoA and CT.
If there are actually any inconsistencies, I was unable to pick them out. This list also probably includes Pokémon with new Galarian forms, as Slowbro is included (but not Slowpoke, which is technically in the game already I guess?). It'll be interesting to see if the IoA Pokédex confirms this leak, and then we can predict what Pokémon will be returning in the Crown Tundra.