Ditto Blocks are required to be found if you want to collect as many Blueberry Points (BP) as you can. As mentioned above, they can only be found while doing group quests with your friends in a Union ...

Blue may be a universally beloved color for interiors, but it encompasses a vast number of different hues and tones, and that includes the highly complex, hotly-debated, and hard-to-define shade, ...