The Dragon Lord
I respectfully disagree. They already had Lillie learning to touch her Vulpix through a Team Rocket interference. Repeating the same plot with Pikachu would have been repetitive. In this way there is actual development for Lillie. With Vulpix she was forced into it out of desperation, but with Pikachu she conquered her fear in a happy moment, outside of desperation, and then a few episodes later in the Stoutland episode she actually consciously conquers her fear and manages to touch Stoutland without any kind of 'forgetting about her fear in the moment'. There is development there in learning how to touch pokémon, and truly conquering that fear is perhaps Lillie's greatest goal in this series.
It's kind of a give and take sort of thing. I can agree that it is better development for Lillie, but it's just not as exciting or interesting to watch, and at this point I think more excitement could go a long way for this series.
I also disagree here. Sun and Moon has proven that it can build plots without different characters of the week to develop its main characters. What CotW/PotW lack is personal investment. I don't have any reason to care about this guy with his Alolan Dugtrio, I don't know him and I know that we'll never see him again after this episode, so it gives me very little reason to actually get invested in that episode or in the problems the guy has with his Dugtrio.
We may not care about the character as much, but the plots are much more interesting. Through the character of the week strategy they can introduce and fully resolve a plot within one episode, which makes any given episode more entertaining. Without it, we get things like the Stoutland episode we had a few weeks back, with no plot or climax to speak of. The episode simply consisted of everyone searching for treasure in a completely normal and non-interesting factor. There was no excitement, no problem to be solved, no plot. It was just kind of there, and otherwise completely worthless. With a few simple tweaks, the episode could have been about some treasure hunter and their Stoutland, looking for a legendary treasure, and teaching the main cast about Stounland along the way. Everything that was accomplished in the actual episode could have been accomplished here, but there could have also been an actual plot. Throw in either Team Rocket trying to steal the treasure or some sort of guardian of the treasure and you'd get an actual climax.