Ginkgo Guild are a group of people who travel around the Hisui Region to provide sales of various items you will need through your travels. It is run by Ginter but you'll encounter others including Volo as you travel
The Guild will set up location at the Jubilife Village outside the Galaxy Hall with two different sellers.
Ginter is the head of the Ginkgo Guild and offers you various specials. He will offer you three items for a short time, with it changing after you have captured 20 Pokémon. These range from Evolution stones to sets of Poké Balls and other valuable items.
Most notably are rare mechanical items that he sells for 20,000 to 100,000. These items have fallen through time and are items that, when purchased, go into your lodgings and allow for you to change the form of the Pokémon Rotom:
As of Version 1.1, he will also sometimes sell a customisation outfit; Unusual Shoes, which are some Slippers.
Tuli is the other Ginko Guild seller and offers a variety of materials that can be used for crafting. These materials are ones which are more plant based and can't be found in the Craftworks store.
List of items sold by the Ginkgo Guild