REMEMBER! This is NOT a story! This is looking at Pokemon myths and explaining how possible they are or could be.
AND I DO NOT OWN POKEMON! Satoshi Tajiri does!
First of all, a big one- Ash's dad. Now, Deliah's pretty… Well, not stupid. Ash reminds me of Mondo Media's "Happy Tree Friends" Lumpy- A huge dumbass. Ash is maybe the largest one in the series. So, the theory of either Oak or Giovanni can't be true! They're kind of… I dunno, smart? I think a dumbass son with a smart(er) mother would have a dumbass dad, but also a good trainer, as well… With black hair! (Unless he has aunts or uncles or anything…)
Ariana, the mother of Silver? That's pretty possible. Think of it- The boss having an intimate relationship with one of his female grunts, she gets pregnant, he says "ohshit," and they eventually decide to have the baby, for some reason... And when Silver was born, Ariana and Giovanni took turns taking care of him until he was old enough to walk and do some essentials by him self, then Giovanni would raise him while Ariana, promoted, (obviously by hard work) do her executive work, and for the sake of the business, they pretend that Ariana wasn't the mother, at least around Silver.
I would guess Gio to be about mid-thirties, where Ariana would be mid-twenties when Silver would be born.
I saw a picture on (I can't remember the artist. I'll add it on when I find out) with Gary, professor Oak, and anime Rocket executive Tyson. In the description, the theory with that picture was Tyson being Gary's son. Well, it's a "coincidence" that both Tyson and Oak has the same hairstyle and faces are similar, and... I've never compared or anything, but Tyson's and Gary's hair colors are generally the same color. This seems like a possibility… I don't really have anything else to say about this.