>>39837716I'm think they're content with giving Eevee to people other than Ash whenever they want to shill it. May, Serena, Gary, and Lana all had one. Plus a bunch of second-string characters like Sakura, the guy from the league, and the chick from the movie. It's probably easier than giving Ash one, since introducing new Eevees means they can keep showing off the evolution gimmick, while Ash's would only be able to evolve once if at all.
