My Boy! is a super fast and full-featured emulator to run GameBoy Advance games on the broadest range of Android devices, from very low-end phones to modern tablets. It emulates nearly all aspects of the real hardware correctly.
This is by far the only emulator that supports link cable emulation with decent speed.
*** To play GB/C games, you need to get My OldBoy!.
*** This is the free version. You CAN save and load with the game's built-in save capability, which is accessible from within the game, not from the emulator's menu.