So ya'll want voice chat with little headsets don't I hear ya but when you asked nintendo for it they gave ya the finger and told ya no. Well my friend there is a way for you to have your dream of being able to talk to your friends while playing brawl and all your other games on your wii with headsets!
Its very simple actually all it requires is a little setup and playing with friends who have access to a computer :P
This my friend is a blue tooth adapter is allows you to connect many devices to your computer including voice chat headsets and wii controllers.
Its not very expensive only a mear $18 you can find cheaper but i recommend this brand as its cheap and good quality for your money.
Next you will need your choice of Blue Tooth headsets I use Motorola but mostly any of them should work with the software we are going to use. You can get the one below for $24 you can get ones cheaper but i wouldnt recommend it if you want decent distance and sound quality out of your voice chat.
Next you will need Bluesoeil blue tooth software it is much easier to use then the Microsoft drivers and if you want to use your wii controllers on your pc in the future you will already be ready to do so. Bluesoeil came with my adapter for free but that may not be the case with others you can download it HERE if you need it.
After installing the software insert your bluetooth adapter into your computer DO NOT insert the adapter before the software is installed and running!!
You should see the main window shown in the picture below.
Click the orange circle to start searching for devices and follow the instructions that came with your blue tooth headset to "Pair" it with a device it may say cell phone in the manual but it will work just the same if its a true bluetooth device.
After your device has been found by the software your window should look like this.
Right click your device if it is shown and click "Pair" and input the passcode that is given in your manual mine is 0000. After your device has been successfully paired with your computer right click it again and click "Refresh Services" it may ask you for a passcode again if so input it like before. Now your screen should be shown similar to the screenshot below.
Now click the little headphones icon and your window should look like this now.
If you have done this correctly your headset should beep as if you were receiving a phone call click the button on it to answer. Once the connection is established you should be able to press the button to turn the sound on and off when using the headset you can also adjust the volume the same way you would when using it with a phone.
Now you are ready to use your bluetooth headset in any application you would like to!
I would recommend the two below for the best gaming experience!
Note: Make sure to configure your applications to use the BT headset as input/output also when your done using your headset unpair it with your computer and charge it frequently when your not using it so its ready all the time :P