This episode was far from boring, it just had no point. But I'd say, with all the Corphish attention, this looks to be the best BF Filler yet.
And if my intuition is correct, this could be the signal for Corphish to never evolve. I believe Ash had to look up Crawdaunt in the Pokedex, correct (now, I'm not 100% if it was Ash). So Crawdaunt has been fully established. Now, I realize in the past that Pokemon ran into their evolutions right before they themselves evolved, but I'm so sick of trying to figure out patterns that I could care less. Which brings us into our next point....
New OP update! Talk about... just plain weird. Dustox finally gets placed into the picture (for whatever stupid reason they kept it out before, I do not know). And also, some Pokemon Mysterious Dungeon advertising. That actually looks like a fun game. What this signifies to me is that they (they being the Pokemon Company and all other related companies) really want to get the message of these new Pokemon DS games out there, possibility to fill the void till D/P or whatever other reason.
I would've like to seen a new attack from Corphish, but oh well.