Obviously PKMN B.W will work off of different servers
Then this is a catastrophe. We can already redirect Nintendo's server to any other GTS custom server at our own will. If we discovered B&W's server directory....
That'd be a catastrophe if somebody did it with DP.
On topic, Trading between Gen V and IV is confirmed to compatible and will be trading and battling which each other normally (Of course not with Gen V Pokémon.), similar to what happens in II and I. DPPtHGSS will still have their own Wi-Fi servers, and we are unaffected. Which means, there is a chance that there is a building. 'The Diamond and Pearl Building' which is enter-able if we have Pokémon that:
Do not carry B&W-exclusive ribbons.
Do not carry B&W Moves.
Do not carry B&W Items.
Are not in new B&W Formes.
Are not introduced in Generation V.
Aren't Bidoofs.
The abilities won't matter since they are determined by the PID and\or class And if a Pokémon goes to a version that the Pokémon is even not the same, and goes back, the ability is the same in the main game. So, no. A Pokémon's ability will be the same if traded to a Gen IV then back to a Gen V game.
This of course may result into the implementing of an NPC that takes Ribbons away, or just confiscates them.
This is one. The other one is a new note in the Pokémon Centre:
We are terribly sorry. The other trainer is from a region that doesn't recognize some of either your Pokémon, their moves, their items or their Ribbons. Please fix these Isshus issues and try again.
This is for the battling an trading directly. My speculations for Wi-Fi.
Direct Wi-Fi:
Did anybody see the HGSS Wi-Fi? It has two sections, the DP system and the PtHGSS system. I bet in B&W we will have 2, the Gen IV and the Gen V sections. When you attempt to battle or trade with Gen V Pokémon, Moves or Items on hand, It'll show some messages. This is for example a trade between the RSE Remakes and the GSC Remakes
May failed to respond... --> SoulSilver
The other trainer is from a region that doesn't recognize some of either your Pokémon, their moves, their items or their Ribbons. Please fix these issues and try again. --> 'Magma'Ruby
This is probably what will happen.
GTS:
1- The Diamond and Pearl Area thingy
2- A simple choice in the GTS:
*Some button pressed.*
Would you like to trade with Sinnoh or Johto trainers? Yes\No
If No --> Continue in the Isshu GTS normally.
If Yes -->
You get the DPPtHGSS GTS Menu, and if you attempt to put a Gen V Pokémon and\or Gen V moves and\or Items:
The other regions don't recognize some of either your Pokémon, their moves, their items or their Ribbons. Please fix these issues and try again.
Just as simple as that.
This whole Isshu thingy is an Issue.
Speculation belongs to me, and only me, 11:28 GMT, 05\27\2010.