Hmm, interesting concept. Well, if we're just transferring these communities directly into the anime world, without modifying anything to make it more "realistic", I have a feeling that most of these communities would be treated rather like evil organizations dedicated to exploiting Pokemon. I mean, take Serebii alone. We're a collection of various fans who want to connect with other fans and discuss (in no particular order):
1) Shiny hunting, which includes sifting through hundreds or even thousands of random wild Pokemon, eggs, stationary Pokemon, etc. in order to find one of a mutated colour. For MM hunters, this particularly means that hundreds and thousands of Pokemon end up released, unwanted, back into the wild, which would probably cause some nasty environmental damage
2) Shipping, which includes compiling masses of data about various people (real people, if we're in the anime world), and coming up with all sorts of arguments for and against who's romantically involved with who, bearing in mind that plenty of these "shipped" characters aren't even teenagers yet.
3) Trading Pokemon, to the point that people will actually open up shops where they collect masses of Pokemon to trade for various offers, including Pokemon and items. These traded Pokemon are often obtained by somehow predicting how the universe works to make Pokemon with specific DNA to appear (RNGing in the "real" world), and are generally cloned time and time again so that more and more of these ultra-powerful, ultra-rare Pokemon flood the world
4) Competitive play, which includes battling with "real" as well as "simulated" Pokemon (battling between cartridges vs. battling on PO). Both types of trainers, however, often insist on using only the best of the best, shunning anything with sub-par personalities or genes, and will generally try to create teams based on what's going to give them the win rather than working with the Pokemon they've developed bonds with.
And that's just a few sections on Serebii. On the whole, if we were to just jump into the anime world without any adjustment, the locals would think we are absolute monsters!