@matrix
This myth had been completelly debunked in detective pikachu.
@LukeAlmighty
Has it? I don't remember much from the movie.
SPOILER DETECTIVE PIKACHU SPOILER
@matrix
I think this image does debunk it well engough...
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SPOILER DETECTIVE PIKACHU SPOILER
@LukeAlmighty
I might be blind because I don't see anything.
@matrix
What am I even doing with my life...
Arguing about THIS TOPIC on the internet... 
SPOILER DETECTIVE PIKACHU SPOILER
@matrix
Alternatively, breeding is usually still possible as long as one of them is Ditto, even if the other parent is gender unknown (such as Magnemite), and in fact, gender-unknown Pokémon can breed only with Ditto.
Source: https://bulbapedia.bulbagarden.net/wiki/Pok%C3%A9mon_breeding
And since there is already a TON of evidence that humans are a pokemon species, you know the rest...