Most of the items for the Collection Book in Colony 9 are fairly easy to get ahold of. The only one that’s likely to prove troubling is the Sorrow Beetle. If you can reach two-star Affinity with the Colony 9 Area, then you can Trade to get the Sorrow Beetle- otherwise, you’ll have to search the lakeshore to find it. It can often be procured by going after Lake Magdalena, as it likes to show up in the little underground cove that the deadly fish lurks in.
Most of the rewards here are very worthwhile, as there is little reason to pass up a chance at an Ether Gem. The Regnas Gauntlets are unfortunately unremarkable, being easy to get by Trade, but the Carbon Driver at the end of the page in your Collection Book is quite worthwhile, a good weapon to have available for Reyn.
If you’re having trouble finding an item for the Collection Book, remember that many people are willing to Trade you Collection Items, and rarer Collection Items are easier to find at night.
Bugs: Prarie Dragonfly, White Beetle, Giant Hornet, Sorrow Beetle (Rare)
Reward: Regnas Gauntlets
Fruit: Dance Apple, Black Kiwi
Reward: Agility Up II Ether Gem
Flowers: Blue Hydrangea, Strong Dandelion, Moon Flower
Reward: Poison Defence III Ether Gem
Parts: Rabbit Diode, Dawn Chain
Reward: Ether Up II Ether Gem
Vegetables: Cool Potato, Red Lettuce
Reward: Quick Step III Ether Gem
Strange: Rainbow Zirconia, Plate Snow
Reward: Strength Up II Ether Gem
Complete Colony 9 Collections:
Carbon Driver