AKIBA'S BEAT (UP)

To earn this trophy, you need to earn a 500% rating during Imagine Mode (when it’s fully charged) against a boss battle. I used Asahi with the Y-Boy song with Ashi and the skills Scorching Symphony and chained it to his EX skill by pressing after using Scorching Symphony. I used it over and over again. I was able to hit over 700% with this method.

Thanks to swrots666 for this method.