[ex-contest entry] Fairy rodents

La-la-la, guess who picked this guy en.wikipedia.org/wiki/Dullahan as a fairy to base Pikachu evo on?

It's Imitation cause I am aware it looks more like dark or ghost...also, he is NOT disembodied - it's just that few parts of him are invisible [in visible state, they are pink].It can walk both on two and four legs interchangeably, just like Pika [invisible back legs are massive].

Shiny has blacks and pinks [including eyes] reverses, and pinks are more bloody red.

Edit: predictably, I lost, so this guy is going to be changed a bit and become evolution of some pikachu relative.
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POST-EDIT INFO
Those pokemon live in places with lots of dark-types, so their grim look is an adaptation.They live in packs.

Nezul
Because of their facial features, they always look grumpy, even when groomed or fed. Voice of this pokemon sounds like high-pitched giggle, and because of that, it was rumored that Nezuls are reborn souls of dead children.
Gancehan
Its heavy body is very strong; when they run, Gancehans obliterate all obstacles in their path. When few of them gather together, their bodies start to glow with eerie bluish-green light.