A crystal and a lay line
you could use a car charger if you happen to have one, otherwise there are no other ways to change it :'(
yea you can the battery just takes longer to charge. i wouldn't recommend doing it on a regular basis though because it can mess up your battery
Yes, you can buy it at your local game shop or order one online.
No, the Nintendo DS cannot communicate with the Game Boy Advanced in any manner.
yes
umm when you buy a dsi it comes with a charger but you can buy it at game stores
There is no charger back then so it uses batterys
No. The charger for the original DS is only compatible with the DS and Game Boy Advance. The charger that the DSi XL uses is the same as the one used by the DSi and 3DS.
Yep
You can charge the Nintendo DS with a Game Boy Advance SP charger (& vice versa) if you have the original version of the DS, the 'Phat' version. Otherwise, the DS Lite, DSi, and 3DS all have their own unique chargers. Each one is different, so you'll need a separate charger for each. (unless you buy an unofficial charger with lots of ends)
The multipurpose adapter will power the Gameboy Advance and Nintendo DS. Older Gameboy models require a different adapter.