Drastic is a fast Nintendo DS emulator for Android. Besides being able to play Nintendo DS games full speed on many Android devices It has the following features:
+ Improve the game 3D graphics 2 2 times their original resolution ( this optional feature works best on quad core devices upscale )
+ Customize the placement and size of the DS screens , for portrait and landscape modes
+ Fully compatible with 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 thousands of cheat codes database
+ Synchronize your save games with your Google Drive online

App link:
http://ithubpk2.blogspot.com/2017/05/drastic-ds-emulator-r2-4-0-2a.html