Light - Umbrel evolves into Lumidusk at WT Silver 2
Medium - Lumidusk evolves into Neoclipsr at WT Platinum 2
Heavy - Neoclipse final stage
Type: Dark / Flying
The western cowboy hat that turns things greyscale is phenomenal for stuff like this!
Light : Grobyc evolves into Tobor by getting 15 eliminations or assists in a round on Nozomi/Citadel
Medium: Tobor evolves into Diordna when receiving an Amethyst badge of any kind.
Heavy : Diordna, final stage.
Types: Steel / Normal
Figured for this one id take some of the absurdly specific evolution requirements for some pokemon and apply it to these guys. And of course, their names are inverted spellings of common synthetic humanoids!
Light - Allurighter, evolves into Champigleam at World Tour Gold 1
Medium - Champigleam, evolves into Nocturnametalli at Ranked Gold 1
Heavy - Nocturnametalli - Final stage
Types:
Light + Medium - Steel / Fighting
Heavy - Steel / Electric
Light - Spectraskul. Evolves into Corvidead at Gold I
Medium - Corvidead. Evolves into Omniseer at Emerald 4
Heavy - Omniseer. Final stage
Their typing would be Dark / Ghost