Rumour sounds plausible tbh as to me it reads like you can play the game by itself or integrate PG if you want it would stand to reason they'd want PG to be able to interact with the new to help bridge the gap between their userbases on mobile and portables even more, the part about it being a sort of remake for Yellow indirectly matches previous rumours of it being a reboot of R/B/G as Yellow was a version of these games and a remake of it would look like a re-envisioned version of them.
Pikachu would make sense as it became the series mascot essentially but Eevee seems odd but then I don't follow the anime so maybe the later has increased in popularity to the point of becoming recognisable, it does all make sense though.







