Do you know what a filler is?
A filler, in relation to a teleivison series, is an episode that can be skipped because it doesn't develop the plot and events that happen in there aren't explictly or implicitly mentioned later.
People don't get to decide what is filler and what isn't.
An episode being filler or not doesn't inherently reflect on the quality of the episode. You can have great filler episodes and poor important episodes.
That just isn't true. This user at SPPF, Torpoleon (
https://www.serebiiforums.com/showthread.php?t=422132&page=8), made a list of D/P episodes and if they are filler or not. And there's a few changes that occur in further posts.
Assuming that list is 100% true, D/P doesn't have a filler until it's 10th episode. So 1/10.
Johto's first filler is it's SECOND episode, EP118. Two episodes later, another filler in EP120 where nothing of importance happens. So far, Johto is batting 2/4. 122 and 123 also are filler, breaking the streak with the introduction of the following Swinub.
Again, specifics. How is the Rotom episode so bad compared to say, Spiniark Attack?
Again, I'm asking you to make specific points.
Plot is bad?
You can't blame contests on the anime since they're in the games since Gen 3, usually introduced along the main plot.