Serena's goal arc should have started way earlier.
Also the arc that used 5 episodes to focus on the overrated jackal should have been reduced to 2 episodes or should have happened later on than it did since the main characters weren't that well established yet especially Serena where she...
I don't mind him interacting with the DP trio, he somewhat makes the chemistry more interesting from what I've seen so far in the Arceus specials. I still find him boring in general though.
Agreed lol, not really much of a fan of gag mons unless they're something like Turtwig or Gible.