There was an exclusive feature to Pokemon Pearl/Diamond with the DS Wireless Communications. At one point in the game (I have Pokemon Pearl, just to let you all know), a man gives you a kit which lets you go into an underground tunnel. From there, you can dig a base. In addition to this, if you go on a stroll through the tunnels, you will meet some vendors. In exchange for a sphere of the right size, you can get an item to decorate your base.
So, the last time I played was about two months ago. Yesterday, I got bored so I started playing it. The problem is, I forgot what the vendors were selling the last time I played. So, my question is, do the items that the vendors are selling change on a regular basis? Thanks in advance.