I think Jessie, James, and Meowth getting that briefcase probably made this not a filler since it could be important to the plot. Which means no episode so far has been a filler and the next two wont be either.
I liked this episode, Darumakka and Hihidaruma were interesting, and I wasn't really expecting to see Hihidaruma's different form, I wonder if that will be shown in the opening some how.
All in all not much happened other then the Team Rocket thing but it was still a nice episode for me.
Have no idea what was being said though.
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