DamonPS2 is a PlayStation 2 emulator for android with remarkably good performance on a wide variety of android devices, as well as loads of games. On paper, it can emulate 90% of the PS2 catalog. Not only that, all those games run very well on this emulator.
Like almost all emulators, you'll have to download the BIOS yourself. This is very important, because if you don't get a BIOS, you won't be able to play anything, no matter how many ISOs you have on your device.
The free version of DamonPS2 a few obvious differences when compared to the paid version, the most noticeable being that the free version has ads. The free version also doesn't allow you to save to a memory card (although you can save from the emulator itself), and has fewer graphic options. Even so, tons of PS2 Games run perfectly on the free version.
Play legendary PlayStation 2 games like Metal Gear Solid 2, Silent Hill 2, Final Fantasy X, God of War, Onimusha, Disgaea, and many more on your Android device with the full featured emulator DamonPS2.