But they don't do that anymore. Kids aren't crazy obsessives like us. They're more than likely to miss at least a few every so often, and it'd be unfair for each episode to have such importance that they end up not understanding what's happened.
But isn't most of DP like that? A lot of DP episodes are connected to events from other episodes.
Looking through the last couple of Japanese episodes, the only "filler" is arguably the recent "Pokemon Hustle" episode, and maybe the Tangrowth ep...but Mamoswine did learn a new move in that ep.
If you actually scan your eyes down the entire DP episode list, a lot of episodes are connected to other eps.