I've seen the term "WiFi" being used to described close-range wireless linking. When they announce an online game they always emphasize the word "online" or use the term "Nintendo WiFi connection". Also every online DS game to date only allows 4 players to play together online, while allowing a bigger number of players to play together wirelessly. The info says the game supports 16 players for Union Room style gameplay via WiFi. The number seems to suggest that this "WiFi" is not online play.
The D/P FAQ states there will be online play twice:
Will Diamond and Pearl be online?
A: Possibly, and probably. An internet source is already claiming that Diamond and Pearl will feature online capabilities.
Quote:
Originally Posted by Eurogamer
Other stuff on show will include the new Zelda game - we're promised that a playable demo will be available. Plus Pokémon XD for GameCube, Emerald for GBA and Diamond and Pearl for DS - the latter two featuring online functionality.
http://www.eurogamer.net/article.php?article_id=58675
Where did this site get this information? was it in Coro Coro or some other reliable Nintendo information publisher?
The second time it states online play in the FAQ presents no sources.
Everyone is so certain that there will be online play but as far as i'm concerned, I don't see any reason to believe it will. Online play is the biggest addition to the pokemon series ever, and there are many technical difficulties to overcome in order to add it. I'm not so sure it will be in.