DraStic DS Emulatorplay.google.com.drastic
In addition to being able to play Nintendo DS games full speed on many Android devices it has the following features:

• Customize the placement and size of the DS screens, for portrait and landscape modes
• Fully supports add-on controllers, and physical controls in devices like nVidia Shield and Xperia Play
• Save and resume your progress anywhere with save states
• Tweak your gaming experience with a database of thousands of cheat codes
• Synchronize your save games with your online Google Drive space
• Increase emulation speed with fast-forward

If you have any uncertainties about the emulator please check out the demo version first, which will let you evaluate how the emulator works on your device.

NOTE:
Android devices using Tegra 2 are not supported by this emulator. We've attempted to blacklist these devices, but if you still have one that is not blacklisted do not purchase this emulator.

What's in this version : (Updated : Aug 23, 2013)

• Address performance problems in Suikoden Tierkreis and Zelda: Phantom Hourglass
• Fix to game saving in Pokemon Mystery Dungeon Explorers of Sky
• Fix to copy-protection triggering in games like Pokemon Conquest
• Now unzips zip files to keep memory free (can be turned off)
• Some fixes to Google Drive integration