At first, when I saw the picture, I thought, well, that that was Kotone's cyndaquil or something. From the picture, I thought (I can't stop thinking of the puns):
Dawn: Piplup use ***** slap!
Kotone: Cyndaquil use back talk/sass!
Cyndaquil (In poke language): Oh no you did not just do that!
Dawn: Piplup, retaliate!
Piplup (In poke language): Oh yes I did!
Sorry, I just thought that'd be a great caption for the picture, and a funny one (It'd be great to have caption contests for the pictures, get funny results!)
Anyways, I didn't see it, but I like the summarization that csips 26 gave. When I read it, and saw the cat fight between cyndauil and piplup part, I thought, "So, all I need to do, is make some modifications, and it'll still be funny!". So, the caption kinda fits.
Anyways, this episode seems pretty funny!
A wittier signature coming soon to a theater near you