I had great expectations for this episode but unfortunately I was disappointed. It wasn't all too bad but it was nothing to get excited about either.
1.
Happiny's evolution happened so quickly and Brock's reaction to it was rather indifferent so that you can't help thinking that it just had to evolve in order for the audience to see one last evolution before the curtain comes down on Sinnoh for good.
So, I'd say Happiny evolving is not a valid argument to call it an important episode.
2. Brock found a new goal? This argument is particularly flawed and I'll tell you why: What difference does it make if Brock suddenly wants to become a Pokemon doctor or if he keeps on pursuing his goal of becoming the world's best breeder? In the end, Ash and Brock will part anyways regardless of Brock's plans. So, this episode didn't have any influence on the plot at all. (You said, however, that it did and therefore mustn't be called a filler)
And by the way, do you remember how passionate he was about staying with Professor Ivy and how he totally changed his mind 32 episodes afterwards? Also, you surely remember how often Ash and Brock have already said goodbye to each other and how often the latter has returned so far. What I want to say is that I'm sure we'll see Brock again after the Unova journey as he obviously changes his mind pretty frequently. If I were you, I'd be very careful when it comes to Brock's ultimate goal because nobody knows what he'll be up to when he comes back.
Anyways, I wanted to show that your definition of what distinguishes a good episode from a filler can't be applied here.
Thus I wholeheartedly agree with Gliscor'd that this weeks episode could have easily be replaced with another great and above all
exciting Sinnoh League battle !
Finally, there's one special aspect I also want to complain about. It might seem to be a minor point at first glance, but for some strange reason it bugged me like hell:

Brock actually had the nerve to throw James' precious bottle cap overboard. No matter how great he was when treating the suffering Pokemon, what did he think he was doing?? In a series which is constantly emphasizing the importance of human values, how in the world can he just throw away somebody else's legitimate property???
To begin with, the explanation for that mess on the ship (Team Rocket "stealing" the
Tentacruel's treasure) was so incredibly far-fetched that you just won't believe it. For James as a passionate collector said bottle cap had an intrinsic value, but I honestly doubt that the Tentacruel had the same intentions with that cap, let alone that they knew about its preciousness. For them it was probably just a random glittering object lying on the seabed, so why did they have to defend it at all costs in the first place??
And this brings me back to my original point of criticism. By no means did Brock had the right to throw away something that meant so much to James. When he cried that bottle caps were his life I could feel with him, and yes, strange though it may sound, I shared his pain. After this loss James must have felt like I would feel if someone told me I wasn't allowed to see and admire my beloved angel Cynthia anymore! Poor poor James!
Isn't it unfair? Brock is being celebrated as the hero of the day although he did something really mean. If that's the moral message of this week's episode, then I'm slightly concerned.
All in all, a disappointing episode and I would much rather have seen another Sinnoh League battle instead!
6.5 out of 10 points
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