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Just wanted to clear something up because I saw this posted a lot, far much more then I would like to see.
I slash a lot of people posting something along the lines "There is no way these starter evos are real, the game concept art from Game Freak... the 'leaked art' does not match the concept arts from the past!"
This is a false statement. This is clearly concept art for the Sun and Moon anime. You can tell this is the case because Ash is present next to Mallow on Litten3's panel. With the presence of Mallow on the concept art that leaked around the end of May/beginning of June (which is when the Sun and Moon anime production should have been in motion) you can clearly see this is the real deal.
And before anyone says it, this looks a little different then past concept art from the anime because a brand new team is in charge of the next season of the anime and not everyone lays out concept art in the same style.