Don't be surprised that DS Emulators are not the best way to play roms. You can get much better compatibility and perfect speed with 
What started out as a GBA development tool and emulator for GBA roms is now one of the best and most compatible Nintendo DS emulators.
Even the cheapest DS/DSi Flash card that these days costs only $10 USD will work better than the best emulator so there is no reason not to buy one of these blank carts for playing NDS roms on DS.WinDS PRO DSi Emulator
WinDS PRO – on a quest for a perfect GBA and DS Emulation System...
WinDS Pro DSi is considered as one of the best personal computer emulator installers / packs for the Nintendo DS (Dual Screen) and DSi roms. It captures most of the features of the handheld console - from graphics to controls and fully integrates DS ROMs with the Windows OS. The basic controls (A and B buttons, directions) are fully customizable on the keyboard. The touchpad, which is basically the lower screen, can be operated by the mouse pointer.
WinDS PRO is not a stand-alone emulator, but rather a program that installs and uses many other free emulators and plug-ins.
Hence, it can run the most number of titles - both commercial NDS roms and DS homebrew. In addicion to Nintendo DS games it can emulate Gameboy Advance (GBA ROM) games. The small installer package can be downloaded from the WinDS official site or from our website. At less than 30 MB, it contains DirectX 9, OpenAL, MSVC++ 2008 and other run time components needed for the emulation. After just seconds of downloading, you are ready to install and play. The best part is that it is for free!
It is an independent Windows application, which has customizable skins and general appearance. You can check the net for guides in tweaking the skins of your emulator.
One of the greatest features I like about WinDSPro is how it adds icons for DS and GBA roms to the windows explorer and makes it possible to run games by simpley double clicking on a .nds file.
Developments
V 2.0.8 is the first version of the WinDS Pro that is written in English. Users worldwide well appreciate this pleasant surprise, since all other versions were written in Spanish. Earlier versions like the V 2.2.1 are compatible only with Windows XP and older Operating Systems. Later on, the version 2.3.x series was released since many people have shifted OS to Windows Vista and Windows 7.
WinDS PRO developers have included the best open source emulators to guarantee maximum GBA and DS ROM compatibility. The built-in emulators include VBA Link (with multiplayer GBA Linling support), VBA-M, iDeaS, DeSmuME, and the No$GBA - the most stable and most popularly known emulator.
System Requirements and Game Compatibility
Fortunately, there is no need for an extra-powerful PC to run the emulator program. It works well with a 2 GHz processor, 1 Gigabyte RAM and 256 MB dedicated video card. Emulation runs smoothly even with 512 GB RAM and 128 MB video shared memory. So, everyone can enjoy DS on PC without having to buy a new unit.
Since WinDS Pro is fully equipped with plug-ins, it can play hundreds of titles which are playable in the handheld console. About 99% of all GBA games work perfectly in it, including all the Pokemon Titles, Kirby and Super Mario Games. Of course, you can play Zelda, Mario Kart, Sonic and the latest Pokemon Games - like you are using a real DS.
However, there still are components of the emulator being developed. For example, some games may require motion and sound, which are satisfied by the tools and microphone of the DSi. The developers have yet to include these features in the program. Hence, some interactive games cannot be finished or be played at all in PC. Although very few, there are games that crash at the title screen or at the middle of gameplay. This is possibly caused by code, graphics and sound rendering problems.
Do not be disappointed if the latest games are not yet playable through the WinDS Pro. The program will on its own periodicly check for new versions and informuser if a new updated versions of an emulator is available for download.
Download WinDS-Pro-2010-10.zip 16528KB