This is the only Game Boy Advance and Game Boy emulator for Nintendo Wii and is based on the VBA-M(VisualBoyAdvance-M) emulator which exists for Windows and Mac OS X. The last release on Github is 2.3.6 and dating back from December 11, 2016. Looks like the project is no longer developed, but the emulator can run pretty much every GBA game and the source is open for personal development.