Echo Meter hint:
Make sure you build up your Echo Meter during each battle so that you can unleash your special attacks with more damage. The meter is built by attacking enemies with your regular attacks, which will build it up to 4 hits, 8 hits, 12 hits, 16 hits, 24 hits, and 32 hits (the latter being the highest). Unleashing special attacks at that plateau will result in the most powerful attacks your characters can unleash, but be sure to use them in the present battle as the meter, even if unused, will be reset before the next battle.
When you need money, remember that you can take pictures with Beat’s special skills and sell them to vendors. Pictures of enemies, especially bosses, are valuable and can net you lots of cash.