The Misdreavus part wasn't disturbing to me, I like Misdreavus. Fillers or filler events in non-filler episodes isn't a bad thing if it is enjoyable, which is, in my opinion, often the case in Jotho episodes.
Ash vs. Harrison was a tense battle, and I'm glad Harrison won, because he deserved to win. It was sad to see the tournament rushed, they should've showed more of the battle in which Harrison lost, and more of the final.
It was bad to see Gary becoming a researcher, ending the rivalry between Gary and Ash.