From what I can tell, there is no proof of "Pokémon Stars" being an actual thing. That image is just fan artwork.
At best, it's just a code name for something the Pokémon team is working on that we have no information on yet. We just know that Ultra Sun and Ultra Moon are the last 3DS Pokémon versions
and what Serebii says here. If it's not on Serebii, it's likely not a thing. They keep pretty on top of things, so alway good to check Serebii.
As the given article says:
Quote:Adding fuel to the rumor fire, Eurogamer published a report in late 2016 that said multiple sources had confirmed a new version of Pokémon Sun and Moon was being developed for the Switch under the code named Pokémon Stars.
And:
Quote:Rumors have been circulating for a number of months about the game, suggesting it might be released under the name Pokemon Stars, but Nintendo offered no comment on this.
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