PokeMini is an Open-Source Pokemon Mini emulator for various systems.

Changes:

Debugger is now complete!
Reordered menu items better
Added Dingux platform (Thanks coccijoe for the port src code)
Fixed issue of sound going out of sync
Separated piezo filtering (now works with any sound engine)
Fixed result of SUB instruction with decimal mode
Fixed PRC rate divider
Corrected some options in configurations file
Multicart support
Made sure shared EEPROM and cfg files are only saved on emulator’s executable directory
Added “Sync cycles” option that allow to trade between performance and accurancy, higher value can speed up emulation but may cause problems
Pressing Left/Right while browsing will now page up/down, selecting drive is now C+Left and C+Right
Unofficial colors palette changed (but still backward compatible)
New zooms: 5x (480×320) and 6x (576×384)
Loading ROM from ZIP package is now supported
More palettes and 2 custom ones, they can be edited by pressing A
Win32 platform is now fixed and updated
Joystick can now be re-defined in portable devices
SDL Only: Keyboard can now be re-defined under “Platform…”
Dreamcast Only: PAL/NTSC can now be selected under “Platform…”
NDS Only: Added FPS counter and rumble pak level adjustment
PSP Only: Zoom from 1x to 4x can now be changed under “Platform…”

http://code.google.com/p/pokemini/