Beat Tales of Vs. and you unlock Tales of Wallbreaker, a mini-game where you smash your opponent into a crystal wall.
Instead of 3D graphics, Tales of Wallbreaker has Super Famicom style sprites and a different battle system. You attack with circle and press X to use snap attacks which knocks your enemy into the wall. When the wall shatters you win!
As a post game reward Tales of Wallbreaker sounds fantastic. Namco Bandai could have sold it as a standalone downloadable game with online play or something.