First of all, you're probably thinking "WTF" righ now and I get that, but let me tell you why Kyurem (Black) is my favorite Pokemon!
First I have to clarify that Kyurem black specifically is my favorite Pokemon, even though I like the white version a lot as well and the base version is not one of my favs, but I like it.
Anyway, my favorite Pokemon used to be normie picks for most of my life, it used to be charizard, Arceus, Giratina and Arcanine, however that changed pretty recently, about a Year or two ago.
I made it sound like some crazy thing happened, but it kinda just changed gradually, as I got interested in other monster taming franchises e.g. Digimon, Megaten or Dragon quest monsters, my taste in monster design has changed to be more edgy and aligned with the rule of cool.
My final point is, LOOK AT THAT THING! It's so fucking cool an epic Dragon with a hyper mode and electric shit!!! And I also love split designs, it's always so cool when a design has two sides with different colors or features, it's so visually pleasing to me.