Nihilego Evolution Path

I was thinking about the Ultra Beasts, and thought "if they're Pokemon from another dimension, I wonder if they have evolutions/pre-evolutions that we never got to see due to being unable to evolve or breed them?". So I designed an evolution family for Nihilego.

The first one is Nilid (nil + id). I really hadn't planned on making a pre-evolution for Nihilego at first, but then I went ahead with it anyway. Nilid's designed to resemble a tiny jellyfish/octopus hybrid and is loosely Metroid-inspired. For the final stage, Noncience (non + conscience), I couldn't have gone with any other design but the 'mother beast' Nihilego from Pokemon Sun & Moon's story.

Thinking of how they'd evolve was difficult, but I ended up with the idea that we couldn't see Nilid due to the only Nihilego in-game being too high level to still be Nilids. As for Noncience, I decided that it could only evolve in Ultra Space, allowing an explanation of how the capturable Nihilego could be so high level and yet not evolve. Keeping with the trend Ultra Beasts share with moves, I had to make their evolution levels prime numbers.