Explanation time for my Lugia event.Professor Juniper : ''Lugia suddenly appeared at Sea Ruins,why was it there ? ''.Ya know,something like Oak said for the birds in Platinum.
The less there is to explain, the easier it is to accept a lack of explanation.
Explanation for Reshiram and Zekrom's disturbance at Dragonspiral.They recongized you as a hero and they created a disturbance to draw you in or something.
That I could maybe see occurring, though there wouldn't be two separate towers. More like what they did with Platinum at Spear Pillar with Dialga/Palkia.
Well, that is a good point, I wouldn't like having every legend from Sinnoh being crammed in the Hoenn region just to fill dex space. That would seem a bit unnatural. So spreading them out among the third game and remakes seems more likely. Or they could just distribute them via event if they so wish. I see that possibility as being likely as well. And concerning Reshiram and Zekrom, they probably will be in Dragonspiral Tower, just because I can't think of any other likely place they would be. So, I'm not too concerned about how that's going to be materialized.
Not to mention the fact that we still need Kanto birds, Mewtwo, Johto beasts, and the Tower duo. ON TOP OF every single Hoenn and Sinnoh legendary. Heck, they very well may make a new Kanto game. FlamingFireRed and LeafyLeafGreen or something stupid like that.
I'd not be surprised if we do end up getting some of those Pokemon above via events. Technically, the Regi trio are 4th Gen events. Probably we'll also get some legends through Ranger games 4-7 (because God knows they milk the dumbest spin-offs the most).
They could also put Zekrom and Reshiram in Giant Chasm or N's Castle (if they make it accessable post-game), though Dragonspiral is most likely.
After defeating Alder and catching Reshiram and Zekrom,Suicune,Raikou and Entei begin roaming Unova with an improved 30 catch rate.
Clearly we need the beasts to be really, really easy. But the region's native roamers can still be at 3 and switch roaming positions every day.
I don't think you understood what I said earlier, the previous region that made an appearance before Unova was Johto. In Johto you can catch the legendary beasts naturally. On top of that, they even gave us an event where you get special legendary beasts. Currently we are drowning in legendary beasts. If they put some trio in there, it will be one they haven't done in a while. Also, I don't think there has been an instance of a pokemon receiving an improved capture rate between a set of games.
We're still going to get the Johto beasts again before the generation is out. They just won't come so soon after HGSS and the shiny beasts that were distributed both over WiFi and at Gamestop.
And, no, they have never changed any defining values for any Pokemon at any time. Gen 1 to Gen 2 special split is arguable, since it was a neccesity, given the new mechanics.