Some wtf moments for me where:
-Greninja losing to Alain's Charizard. I was up watching it live, 6 am, sure as hell that all the build up and hype wasn't gonna be in vain. I'm sure the fact that some writters themselves were dissapointed means that Ash was supposed to win but they had to force a loss on him cause they weren't ready to let him win. Fortunately that changed in Alola, but still. WTF.
-The Magikarp/Slowking episode from the current series. Most random episode ever, but that's not necessarily a bad thing.
-Ash ordering Charizard to use Seismic Toss against Dusclops. More like a "face palm" moment, but still, wtf Ash.
-Cameron using only 5 pokemon at the Unova Pokemon League cause he FORGOT one and still WINNING against Ash. What the F?
-Tobias coming out of nowhere with 2 legendaries at the Sinnoh league.
-Go catching a ton of pokemon without battling during the first couple of episodes of this series. Luckily they've stopped doing that so much and he actually fights/befriends a good part of them before catching them now.
-Mr Mime being used all of a sudden and being a badass. Not a bad WTF though, but still.
-Pikachu losing to Trip's Snivy. I know, he didn't have his electric attacks. Still, that already set the tone for what was the worst series in Pokemon, imo.
Don't you sass on the one team member who meant to swipe Elesa's team by itself.
That's one of the WTF moments I had with the anime for sure. The whole episode felt so out of character for Ash. Never once had he tried to beat an entire gym with a single pokemon before, much less have only 1 pokemon at hand at a time for no reason and overthinking simple decisions. That episode is the embodiment of most of what's wrong with BW.
I enjoyed BW for mostly it’s humor. I think besides OS it had the best humor and cast chemistry.
As for cast chemistry, I think Sun and Moon did a very good job. I didn't enjoy some of the humor in BW because it was based around Ash being treated like a child by a Misty rip-off. Of course, that's the least of the problems BW had imo. The way they portrayed Ash, almost hitting the reset button to then realizing they had made a mistake and bring back a lot of characters to try to make up for it. The only thing I was interested in that series was the new TR plot, and the fight against Team Plasma, but then that got cancelled and everything went downhill. That series had potential if they didn't make Ash stupid and actually develop the plot points they seemed to had in mind. But in the end, it was a completely forgettable mess.