Strange swinub?

I just found a purple swinub with weird sparkles around it. What's up with it? It sparkles in the same way as the epic zubat, but purple instead of blue.

It's a crystal.

On this game, there are 4 types of "Special" Pokemon : Golds (1/1024 Probability)(entirely gold, with yellow sparkles), Crystals (1/2048, purple sparkles), Shineys (1/4096), and Pixels (Very Pixelized sprites, grey sparkles)(1/8192)
The shiny booster does not affect the probabilities of Pixels, Crystals or Golds Pokémon.

But do they give stat bonuses or anything, or are they just aesthetic changes? I saw that the profile has a list of how many of each kind you've caught, but I don't see any information anywhere about what they actually do

It's just aesthetic changes, there's no boost bonuses or something like that ^^

Ah so it's the same as shinies in the games. Perfect, thanks. :)

You're welcome ^^