"You can freeze my region, steal other's Pokemon and do all sorts of evil deeds. But freezing the sea... IT'S ON LIKE DONKEY KONG!
Marlon isn't really obligated to care about what happens or not with Unova. Maybe the deaths of a lot of people and Pokémon does not bother him.
We can see from the official English site that they're basically giving Marlon a laid-back way of speaking.
As for why he's not helping, his philosophy is to not judge others based on what people say about them. Sure, you say Team Plasma is evil, but he has no first hand experience with either Plasma or the Player Character....a person could easily just say someone's evil to turn them against you. I think that's the main point.
I think it's a bit difficult to see where Marlon is coming from. Since we, the player character, have already been exposed to so much of Team Plasma (past and present), it's a bit jarring to have someone like Marlon take such a neutral stance on the issue.
It does not matter if other characters knows and/or have seen what Team Plasma did and plan to do.
He did not see Plasma doing anything, so he will not judge or battle them.
It is nice to have a character with different values once in a while.
One thing that I remember reading in one of the various interviews that I was linked (not sure if it was Iwata Asks or Famitsu or even something else), was that how Team Plasma were portrayed in each area of Unova would influence how they're thought of in B2W2, from each area's different opinion of them.
Marlon could be the extreme of this -- two years ago, perhaps they never bothered Seigaiha, and since there's even a character that says Marlon's said to spend seven days and seven nights a week in the sea, it could be just that ignorance is bliss.
Well, Seigaiha wasn't there 2 years ago, so...
Not to mention we don't know how fast news travels around Unova, but that shouldn't stop a whole town from being ignorant since I saw TVs in the huts. Did anyone in Shizui's town ever mention the sudden ices in Opelucid?
Also, Shizui setting off the "trap-the-oddly-is-a-ship's-gangplank" makes it seems that he does care, somewhat, so the PC/Rival and Plasma can duke it out to see who's "in the right", and he doesn't want in on that. It would've been alright if he saw Plasma do their dirty business, and THEN see how evil they are firsthand, but that's a bit cliche and was used for the other gym leaders. It's interesting to have a true neutral character.
Oh god, I feel like I'm contradicting myself somewhere from my earlier posts, but I'm starting to see how he really ticks, lessening my aforementioned disappointment.
There's also this example in one of my classes regarding differences in how people see events play out in which some people see events unfold linearly, that is, when something negative happens, it will only result in negative outcomes, while others see it nonlinearly, where negative events can breed both positive and negative results. For a fictional example, Avatar Kyoshi's creation of the Dai Li had the immediate positive effect of stopping the peasant rebellion and making the Earth King listen to his citizens' problems, but in the long run created a corrupt government force.
...but basically, what I'm saying is that what if Marlon doesn't see events unfolding in a linear fashion? Here's an in-game example. Ghetsis basically raises N to be his pawn, and if you see things unfolding linearly, you'd assume the rest of N's life would be terrible and all of Ghetsis' actions only result in people getting hurt. But what happened as a result of Ghetsis' actions is that N now travels the world teaching people about how to live in harmony with Pokemon. What's even more interesting is that Ghetsis' actions also lead Alder to re-evaluate his role as Champion, leading him to retire so he can spread the word on how to live with Pokemon, and Brycen to reprise his movie star roles so he can use movies to spread this message. Remember that before this, Alder was roaming Unova depressed about his dead Pokemon, and Brycen became a recluse gym leader. So perhaps Marlon doesn't like to make snap cause-and-effect judgments either.
Regardless of what he is thinking, I think what's obvious is that his personality fits his type speciality--like water, Marlon goes with the flow.
Wasn't Aspertia a new settlement? How "old" is the Marine tube supposed to be? Just curious about clearing stuff up is all.
Speaking of Plasma run-ins, did Roxie have one?
New settlement doesn't mean "popped up in less than two years" nor does it mean every unseen city had been newly developed, but yeah, I'd like to hear more about this.
Does the old Team Plasma help you against Neo Team Plasma?
So I don't know if this has been mentioned before, but Caitlin has a Gallade. I wonder where she got it from.....
Obviously spoilers, but encounter #10 Giant Chasm (after Route 22)
To answer your question matt0044, the memory link event shows they're there taking care of the Pokemon abandoned by Team Plasma and left behind by N.