Well if this doesn’t confirm the starters aren’t real to people, I don’t know what will.
So apparently the Japanese Pokemon Twitter Account accidentally revealed these too early & deleted the Tweet. Game Freak. Why you always do this? Also here is their Japanese names. The Grass starter is known in Japan as Junaipa (ジュナイパー), the Fire as Gaogaen (ガオガエン) and the Water as Ashirene (アシレーヌ).