This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to use the global trade system on wifi
Find a wifi hot-spot.
In your diamond or pearl game go to jubilife city.
Find the gts building.

Select from the following. (A). Get in there and press r, b9 + r, then rgb (menu). The symbol may say gts is the spot. (B). Head upstairs to the shop and talk to the clerk. After that you can't waste money and have to pay the quidditch man. (C). You should notice some hiding places below the building which you are prompted to locate. Go to the shortcut on a mac or an explorer window. (D). Register your location on the globe, it makes it more fun. Put any pokemon you want to trade in your party.
The answer is:
(D).