It doesn't exist.
The person on nintendolife lied about that post (because it never existed).
Go to http://www.gamefaqs.com/
Search Mario Tennis
Find the HORIZONTAL (that's left to right) row that says wii(assuming you're trying to find solution to the vc game)
Click on saves
From the save file description itself.
NATE - All GBC-only courts have been unlocked. GBC Characters using default names have been transferred. Nothing else unlocked or done.
Then...
In order to use a Wii Game Save File, you'll need to use an SD card and an SD card reader on your computer. Copy the downloaded file onto the SD card into the directory as
X:\ private\wii \title \GAME \data.bin
(where X: is the drive letter of your memory stick, and GAME is the four-letter ID code for that particular game, which should be listed on the save description). You can then take the SD card and insert it into your Wii, then use the Data Management menu to copy the save from the SD card to your Wii.
In order to use a Datel Wii Power Save, you'll need to purchase and use the Datel Wii Power Saves package. See the included instructions on how to transfer saves to your Wii.
Listen, if you don't find it, looking at every part of the forum may help, but most likely it won't. It just means it doesn't exist.
Wrote up the answer in literally 3 minutes.
http://www.gamefaqs.com/boards/997707-mario-tennis
