WiFi - Where the action's at.
If you swap friend codes with other people that constantly play, or have a lot of friends with Hunters, then this game is well worth your purchase. The online system for friends is great, while searching for random matches pretty much is the same from Mario Kart. If you have friends, you can create games, or join your friend's game. You just click "Create New Game" and choose the settings, then just wait for your friends. Inside a gameroom, you can voice chat with your friends by holding down "X" and speaking into the microphone, or you can just type in text.
The game is great at most times, but you still might have framerate issues. When playing with many objects on the screen, the framerate of the game will slightly drop, sort of like lag in an online game where you are the one lagging. Other than that, Hunters looks to be the most beatiful game on the DS to date.