Best filler episode I have ever seen. One part that didn't make sense was when Aipom was injured with a Shadow Ball. We all know Ghost type attacks don't affect Normal types like Aipom.
I do have to agree that Shadow Ball has overstayed it's welcome in the Anime. I was happy when I first say it in the Johto series, but now, it's just old.
The funniest part in the episode was when Weavile threated Meowvile(Yes, I combines their names)with a Shadow Ball, I couldn't help but snicker.
Kinda funny how Ash comments about Aipom weighing to much when it sat on his head at the begining and end of the episode.