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A-ha! I was wondering this, too, and nobody seemed to know where they were from. About two months ago I did a little googling and found this: https://www4.atwiki.jp/hitec/pages/60.html
It has pictures of almost every pokemon like that. It's in japanese, but I don't know if it's the original page or not. Well, at least it has worked for me! ^.^
I'm sorry, but this isn't really a topic ]: All you're doing is just asking where those pictures are from, and since Suzume provided a link with all of them... I'm inclined to close this. If you want to discuss them further, you can do so in the Pokémon Chit-Chat, but they don't really deserve their own thread~