If there's one thing we should probably clear up right now, its that the trailer is of course not accurate, as we're going to see in the final game. I'm guessing that the game will actually function like some sort of Dream Radar/Google maps hybrid, where you might get to see a Pokemon on the screen and then interact with it, in battle or whatever. You will probably be able to trade with FB friends or those in your WiFi radius. That being said, if they actually did something like Mewtwo, it would take a shit-ton of cellular data, but if Nintendo actually bought out a few screens in Times Square or whatever that could actually come true to an extent. We'll see.