Filler or not, I quite enjoyed this episode if only because the premise and setting isn't the generic set up we usually get.
The episode took place in a fairly unique town (lots of stone around, the clock tower), not to mention it took place at night for once.
Team Rocket did very little except be mysterious about receiving their next mission. I have to say, Team Rocket's small involvement so far seems to be making the writers to put a little more effort into their episode plot-lines.
Not much to say about Darumakka and Hihidaruma. I liked their spot in the episode, it was entertaining.

Overall, a pretty decent episode, all I can say.