Go to -> Data Management -> Save Data -> SD Card .
: Installing the Homebrew Channel on your Wii allows you to use various homebrew applications, including those for managing save data. This method, however, requires some technical knowledge and could potentially brick your Wii if not done correctly.
This specific entry in the franchise introduced several unique mechanics that are fully accessible via a complete save: Rider Arts : Specialized flashy moves unique to each rider. Expanded Battle Styles : Includes Tag, Support Attack, and Speed Up styles. New Finishers
If you have a physical Wii console, you can use an SD card to transfer the 100% save data.