>>35091015No one said he is. You know, just like the father of my older sisters and the father of my younger broth isn't my father. Being with someone at one point in time, doesn't mean all children produced by her are yours, child.
But yeah, it's not even just someone's headcanon. Not game canon or anything but the play Pokémon Live back in 2000 had him being an old boyfriend of Delia. And she specifically tells Oak that, so it's not open to interpretation.
