Despite the glaring double-negative here, I think this question is probably one worth asking. Whoever asked was probably just joking around, but I looked into it anyway. A thread on Serebii offered a few opinions. What do you think? I went with this postulate:
a196 Your dad isn't shown because he's not in the game. Some have speculated that the reason Pokemon protagonists lack fathers is that Pokemon's creator did not have a strong father figure in his life.