There is no mention of Artemis interacting with faeries in Asia in the books. His primary interactions are with the faeries of the Lower Elements, which are located in Europe and Ireland.
Artemis's methods for gaining access to faerie information typically involve:
* Threats: He often threatens faeries with violence or exposure of their existence to humans.
* Bribery: He frequently offers them valuable human objects in exchange for information or favors.
* Manipulation: Artemis is a master strategist and often uses trickery and deception to get what he wants.
Perhaps you are thinking of a different character or a different series? Could you provide more details?