If the Aura Guardian was Ash's father, well that would be impossible, you mean great, great, great something grandfather otherwise his father would have to be 500 years old.
Anyways good episode, I liked seeing Spiritomb it was interesting and kinda creepy (Spiritomb's game cry... There's something about that cry I can't explain, but it's spooky, weird and something else but I can't think of what exactly).
Nice to see Ash and co doing the motto lol, once again Ash, Brock and the main girl (Misty/Dawn/May) got to do the motto, I am sure May did it but I don't remember when. I hope one day we see Cynthia's.
And yeah it was a bad idea to place that tower right there, should have been hidden aleast.