Yeah, the Jessie/Seviper match is one, but it's so awesome, I don't care. Heh.
I have one with B/W Giovanni and the Rocket trio. Given his normal lack of confidence with the trio, why would he suddenly believe that the trio was actually responsible for taking down Team Galactic and J? Could they? Potentially, yes, but I find his sudden faith in them as a subtle WTF. Granted, he doesn't exactly know if they are or are not embellishing certain details, but you get the impression he wouldn't be so easily fooled. (Compare his reaction to when they asserted the same thing with Aqua/Magma.)
Unless he has a larger goal with the trio in mind (using them as disposable pawns), or to keep an eye on them for a change. I dunno, but I wish they'd spell out his motivation better.
For a less complicated one, can anyone explain to me the Princess Salvia arc, and how Dawn apparently never heard of the Stranger Danger PSA?