This would include Pokemon that could only get their HA in dream world.
Pleaselog inorregisterto add a comment.
With the addition of the Ability Patch, any Pokemon available in Sword and Shield or it’s DLC can now have it’s HA.
This leaves a very small list of Pokemon still unavailable with their HA. If the other answer is to be trusted, that would seem to leave Patrat, Cranidos, and Shieldon as the only Dream World Pokemon who have not had it’s HA since. However, Watchog is able to be found in Hidden Grottoes in B2W2, so it’s family’s HAs are not actually exclusive. Cranidos and Shieldon are available with their HAs through the egregious Dropped Item quest in B2W2.
That means any Pokemon who can’t have it’s HA has to be a Pokemon originally from Gen 6 or 7 that is not in SwSh, Friend Safari, DexNav, or Sos chaining.
That’s it!
Any Pokemon that is not in SwSh or Dream World can be SOS hunted, or have gotten their HA from a Pokemon Bank event.
Source
EDIT: Forgot the Gen VIII fossils.