During this time, I cannot play internet-based games T^T Due to my new home area does not have any broadband internet. So, then I use the internet at my old home to get a NDS emulator and roms with me (ha)
Since emulator and rom are piracy. So, I would like to suggest that please supports genuine hardware and software.
Anyway, you can get emulators from here.
http://user.kemonology.com/zeromaru/games/emulator/No$gba2.6a.7z
description: this one is a pack of No$gba 2.6a and No$Zoom
credit: Zeromaru via http://www.soi13.com/board/thread-165-1-1.html
gba 2.6a is enough for playing game but zoom has a bigger screen.
They have been set to play game immediately but sometimes there is no sound click option > Emulation Setup. Then Sound output mode please be sure that you choose Digital Mono(fast) 
After you done, click option > Save Options.
PS. please support genuine hardware and software.
Talok-Toktak 