This is just an exhibition match in which the CPU is set to the highest difficulty setting and the FF Trio has their alternate colors.
The CPU on the hardest difficulty sure don't mess around. To get the FF Trio's alternate colors you have to get a Gold Trophy on the Hard Rainbow Tourney, which is probably one of the hardest achievements ever. I got them back in November, 2 weeks after the game came to Wii U VC. And since I got the alternate colors, I decided to test my skills by fighting them on the highest difficulty setting. Enjoy!
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