Okay...wow...
Oh boy. You're wrong. That's judgemental, you're basically saying people who don't know anything about pokemon is unable to play it. How the fuck do people play other MMO's they've never heard about before? That's a stupid ass thing to think, just no, so wrong.
There is no "meant for hoenn", or "meant for kanto", or "meant for my mum's house only". There's a whole game, and if they're gonna implement something, then they're gonna do it over the whole two regions, not just Hoenn.
Here's the thing. Even if this was to be implemented, you'd only get 1 tab in the whole game to search shit up. Fuck your favourites, I'd rather open a browser with 5 tabs about breeding, egg groups, smogon movesets, another 5 for social networks, 3 for youtube, 2 for spotify, and as many as I fucking want for everything else. Please do explain how having everything stuffed in one tab is more "convenient" than having everything spreaded nice and easy over more tabs? Again, it's stupid.
It wouldn't be fun. It'd be shit. It's fun in practice, doubt it'd be actually working ingame. Most MMO's don't even want to try and waste their resources supporting this kind of an idea. I'm not saying it's bad, it's good, but it's worthless compared to what the mods have in mind to do, and what the community wants right now.
As far as I know, the main features of the PokeNav haven't even been announced to be allowed in any recent patch notes or announcements. Prove me wrong, I actually might be with this, but I doubt it.
Now for my final point. All you're saying here is basically speculations. Speculations on how it'd go if mods just swung your way, accepted this suggestion as a legit one, dropped everything they were working on about this game, and only focused on this one suggestion. It's unneeded work, it's not more effecient than running a browser as having info about the game, and as sure as hell it isn't more convenient.