Could have been structured better. You throw jokes in out of the blue, without any proper timing or even logical sense. The Mr. Mime joke was blunt, the random call joke was funny, but totally distracted from the plot, and the whole Pokemon "I don't have to listen to you," "Arrgh I'm angry and discontent" thing is very old by now, even if used with a slightly different setup.
That said, a lot was funny. The way you drew and animated was hilarious, and the animation itself was beautiful. I loved how the battle took place in a bathroom; really shows how ridiculous these Pokemon trainer challenges can be.
So the flash was certainly not awful, but I feel that if some more effort and thoughtful planning was put into it, it would be something even greater. But that's just my opinion.