I'm actually questioning your examples, because I'm not seeing the condescension, I'm afraid. That isn't bad dialogue though I would definitely put it around the 6th to 7th grade level of vocabulary however. That being said, Pokemon is a bit unusual because its dialogue jumps around the grade levels a lot. The Delta Episode has quite a lot of late high school level dialogue actually (Zinnia's Story at the end of the episode has vocabulary that I really don't expect many kids to actually get, but it conveys emotions rather well, making it good dialogue), and Sea Mauville is close to College level.
So what exactly do you mean by "Writing", do you mean vocabulary? Or do you mean narrative arcs? Or do you mean writing flow?
You argument is rather poorly written I'm afraid. I'm not convinced.
Edit: On topic of the Anime, Some parts aren't particularly convincing, the deus ex machina that is Tobias comes to mind. However, I would regard the current season of XY(&Z) as above average. It's rather entertaining and is a actually pretty solid visually for a long running show. It's definitely has quite a few tropes of the shounen genre (Of which I despise that term but I digress), but it also breaks away at times, which is good and keeps things interesting. It has nice filler which is actually something I can't say for many long running shows.