Devon Goods is a key item the is obtainable in the GameBoyAdvance versions of Ruby, Sapphire, and Emerald. It is given to you in Rusturf Tunnel after battling and defeating the Team Aqua/Magma grunt. After traveling back to Route 116 on the border of Rustboro City you will encounter an emplay of the Devon Corporation. He will take you the Devon Corporation's president: Mr. Stone. Mr. Stone will say thank you for retrieving the Devon Goods and will reward you with the PokéNav. He will then ask you to deliver the Devon Goods to Captain Stern in Slateport City. After doing so return to the entrance of Rusturf Tunnel on Route 116 and you will find a Devon employee who will reward you with a Repeat Ball.