I think I'm fangirling, seeing as I drew all three of these in one day... (Count Bleck from Super Paper Mario, and the 'rainbow butterfly' is a Pixl named Tippi. The book is the Dark Prognosticus.)And Dimentio
And here is some actual pokemon:
And here's an old drawing of a crossover between the two:
Last but not least, Deku Link from Majora's Mask.