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Fire Red & Leaf Green: Wireless Rooms
Here is some info on the new Wireless Rooms, that use the Wireless Adapter to link you with other people around you.

Here is a screenshot of a Wireless Room in Kanto. Anyone that is in a certain distance can join the room, and you can chat, battle, or trade Pokemon with other people in the room.
Here, the trainer is starting a conversation with someone. You can choose to battle, chat, or trade with this person. There may be even more possibilities.
Here is a chat between two people. The keyboard is to the very left. To use the keyboard, you hover the icon over the letter you want and press A, from there you form words etc.