YesFor what game? Sword & Shield?
For the, uh, "foreign" Pokemon (its how they're labeled internally) in SWSH they still have dex entries even if they don't have an actual dex entry. So they go unused but they still wrote them up. So taking Rowlett, as an example...
Sword: At a distance, it launches its sharp feathers while flying about. If the enemy gets too close, Rowlet switches tactics and delivers vicious kicks.
Shield: During the day, it builds up energy via photosynthesis. At night, it flies silently through the sky, on the prowl for prey.
Completely unviewable. Only reason we know it exists is because of datamines.
Anyway the only new "foreign" pokemon like this in the IoA update is Magearna. Which is why I first was curious to see if they kept writing dex entries for things that would never show a dex entry and am now curious to what the entries actually are