I saw the episode, and it was a pretty good one. I'd expect nothing less from a Rocket-centered filler.
-when Rocket Dan are kidnapping Pikachu at the beginning, Pikachu actually escapes by simply unhinging a lock on its cage. XD
-shortly before splitting up, Musashi mentions having a talking Persian, which obviously makes Nyaasu emo.
-sweet, a One-day Tournament in which Heigani gets some battle spotlight, plus a Kairos gets to appear. Distract people from getting their Monster Balls stolen by having a tournament... why can't more Rocket schemes be like this?^^
-LOL! Garagara gets KOed, and then its Bonemerang returns to bounce off of its head. Nice touch.
-Yamato wore a mask of Joy, in which the mouth didn't even move (but as you'd expect, it was enough to fool anybody).
-we get to see more of Takeshi and his strange reactions around fakes. Masato pulls him by the ear only for Takeshi to say he didn't feel anything (it's worth noting that when he asks "Joy" to clean his Monster Balls, he doesn't do it in some over-the-top flirty manner like usual). Haruka makes note of this when Masato reveals Joy was a fake.
-Yamato mentions Nanba, getting his name wrong again. Out of nowhere, Nanba calls her to correct it.
-is it just me, or when Yamato/Musashi were asking Kojirou/Kosaburou to pair up with them, they did it in a very seductive manner? Some people in the shipping business are gonna have a field day, I just know it.
-when both switched-up duos do their respective mottos, Musashi and Kojirou were saying lines from their new motto, while Yamato and Kosaburou are using their lines from their unchanged mottos. These mottos have different formats (since Yamato/Kosaburou's motto have the same format as Musashi/Kojirou's old one). As you can guess, there was a bit of confusion (and the girls getting frustrated XD).
-Takeshi calls Kojirou "Kosanji" (which Kosaburou is constantly mistaken for).
-some of the audience members of the stadium were disguised as Rocket grunts (though, it's a bit of an insult that they're using unevolved Pokemon like Zubat and Dodo while all those kids have things like Saidon and Kapoera... and this is the friggin organization here, not the usual comic-relief guys).
-this is interesting.... when Satoshi-tachi are giving their speech on the importance of their Pokemon and all the memories, journeys, etc. they share together from the time they meet, we see still-shots of Satoshi recieving Pikachu (and in his pajamas I might add... that's better continuity than that "World of Pokemon" thing played before some of the older movies), a scene of Pikachu battling, and... get this, a scene of the group along with Achamo and Oosubame. I can understand the significance of Achamo, since it's Haruka's first Pokemon and goes along with the scene of Satoshi getting his Pikachu, but what was the purpose of Oosubame? Seems kinda wierd, especially considering Oosubame and Achamo were around together for a rather brief time before Achamo evolved.
-that Morphon and Ledian seen in the preview just belonged to some random grunt and some random kid during the big brawl.
-three vocal songs are featured this episode. Maemuki Rocket Dan (which was kind of a given) played at the beginning, Pokemon Symphonic Medley plays when the Monster Balls are rolling into the stadium and a bit into the fight with Rocket Dan, and Nyaasu no Uta when Nyaasu is bringing up how they used to divide everything three ways before breaking up that biscuit he found earlier (right before the moment's interrupted by a kid coming up and having Saidon use Fury Attack on them). Maemuki Rocket Dan plays a second time, after Yamato/Kosaburou are blasted off and when Musashi/Kojirou do their motto.
-Rocket Dan blast off saying "Ii kanji!" (This feels good!), as opposed to the usual opposite. They're apparently too relieved to be back together to care.
-OK, I forgot to mention this last episode, but what the f*** is with that "Remembering Pokemon DX" for the Trivia Quiz? Where does the "DX" come in? It actually seems even more retarded than the regular "Remembering Pokemon". At least that called for being sure to spot certain details in the scene. This just asks you to recognize 6 Pokemon, then replaces one with its evolution. Wooh! I noticed Dodo got replaced by Dodrio, I'm a friggin genius. God, this thing gets dumber by the second.... is Orchid's lecture ever gonna come back?