Thanks! Glad you like it.
Regarding the data, I am a bit hesitant about sharing the images since it is not my own data/images, however I might add them later to the repo since I think there won’t be a problem, and it is a bit unfair to share this without the data; I’ll edit the article once the data is in Github.
Meanwhile, I can point you to my original source: http://bulbapedia.bulbagarden.net/wiki/List_of_Pok%C3%A9mon_by_National_Pok%C3%A9dex_number
From there, click on every Pokemon on the list, that will take you to the page of the Pokemon. Then click on the image on the right side and choose the size of the image you want and save it.