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The only trailer on Youtube regarding this game to ever reach that number in views is the Greavard reveal video at 11M, and even that is dwarfed by the Ed Sheeran music video, which I can say confidently that no actual human being gives a shit about. Trailers that show the actual game are half that if not even less, at between 2 to 7 million views. Half of these videos in question are Pokemon reveals.
So either there's a weird disconnect of people who care more about the Pokemon game than the Pokemon themselves (which isn't true because the Competitive play video also has 2m), or someone's committing sales fraud.