This theory has a flaw, though. Remember the DVD special "Mewtwo Returns"? When the group is captured, Giovanni comes up and orders them to be locked up, or something of that nature. So he definitely had a chance to see Ash and to recognize him.Originally Posted by Ray_Lee
The counter-argument, of course, is that he either didn't see Ash or he didn't recognize him (as Ash has probably aged a bit since they saw each other last, if we assume that they are indeed father and son). However, this assumption makes it difficult for there to ever be a father-son reunion, as Giovanni has never seen Ash other than that possibly (so he likely won't see him again), and if he didn't recongize him, then he never will unless introduced by name (which is highly unlikely).
But this theory has some definite problems. It's still possible, but it'd take a lot of work by the writers to explain everything.