One of the reasons why the alchemy product is such a key part from the game is you will ultimately, when i did, reach severe difficulty spikes that all but require you to synthesize superior equipment. Any weapons or armor that you can buy serve mostly as base materials to then craft into stronger gear.
Aside from what's been stated, you'll probably find five or six additional pieces towards the alchemy puzzle, which I'll leave that you should discover.
It's not often which i stumbled upon a JRPG whose satisfying story elements and inclusion of complex systems is really so good. The visually appealing realm of Atelier Ryza 2 serves mostly like a platform to farm items for the purpose of diving head-first into the pool of alchemy. While the characters themselves may not have probably the most depth, time and attention provided to making the most important aspects of the game click count how much they weigh in gold.