List all the pokémon that doesn't have an evolution or a pre-evolution in any generation (including both legendary and non-legendary pokémon)
Mega Evolution doesn't count as a proper evolution, so pokemon without an evolution but with a mega evolution still count as "perfect"
Those are all evolutions of regional variants, but Girafarig has Farigiraf now and that is a direct evolution, as well as Dunsparce having Dudunsparce.