Raremorph Radar questions.

​So I know the Radar acts as an additional way to hunt for specific beasties, but what happens when you use it on a beastie that doesn't spawn normally at all. Like the evolution of troglum or gaskit or webbounce, does it just use the pre-evo to spawn?
(Side Note: I dont use Reddit all that much so sorry for the spoilers in advance)​