>>39498904One of the ways to develop your sync pairs is to battle in the training area, which you'll discover early in the story. There are four different types of training areas—Level Up, Strike, Support, and Tech. Level-up courses will net you level-up manuals to immediately give a sync pair XP, while the latter three courses are a great source of the role-specific items that help your sync pairs learn new moves and passive skills. These courses can be done repeatedly to collect lots of items.
Once your team gets more powerful, you can also do supercourse training. These more challenging courses can only be completed a certain number of times per day, but the rewards will be far greater than their regular equivalents. You can unlock higher difficulties of both supercourses and courses by defeating easier ones, and each difficulty of supercourse can be cleared three times each day.
Supercourses are likely to be your first opportunity to get rare items like Ultra Tech Tonic and Ultra Aid Ade, but your team will need to be pretty powerful to clear these battles. So try to build up your sync pairs enough to clear these battles for their rewards as soon as you can.
You can also exchange common versions of these items for more powerful versions at the shop. You'll need to trade 50 Great Buff Blends to get the much rarer Ultra Buff Blend, for example.