When you get a 100% game completion and have beaten the final boss you can then transfer SP, TB, EXP and Stats from an old 'Save' file to a new 'Save' file.

Here's a little trick to get easier EX Bonuses for the dance. Plug in a Playstation 2 controller which because it is not Sixaxis capable will pick up the normal shaking automatically giving you an advantage in any battle where EX is used.