To view actual Japanese characters instead of ?????, you do the following.
Windows Vista/Windows 7:
Go to the Control Panel (Start > Control Panel).
Select the Change keyboards or other input methods link under Clock, Language, and Region.
At the top, select the Administrative tab.
Click the Change System Locale... button.
Change the drop down list to Japanese (Japan) and confirm.
It will prompt you to restart. Do so.
I would also like to ask the following, has anyone had any luck changing the nature of a Pokemon? I managed to change a couple Pokemon to shiny, but not their nature. Doesn't make sense to me, since they both rely on the PID. Anyone else have this problem?