What's the BEST GBA emulator for R4 2014 ?

If you mean gbaemu4ds, I've tried it.
I launched Precure, Mermaid Melody, MARIOKART Super Circuit and Shin Megami Tensei 1 with gbaemu4ds in R4 SDHC Dual-Core on my 3DSXL.
Mermaid Melody had no problem in images, but the sound is horrible while playing, making the BGM, a vital fact meaningless.
MARIOKART's image is doomed, I can't see the roads while racing.
About SMT1, the game stopped after you named yourself and tried to pass a door.
Well Precure worked perfectly......to my surprise.I hope you guys can recommend a better GBA emulator for R4......

None, don't bother searching further. If you want to play GBA on your 3DS, go for SUPERCARD DSTWO, it got its own GBA emulator. R4s can't emulate it properly, lacks the spec. If buying a DSTWO isn't possible, play it on an android device, GBA.EMU.apk should suffice if the device's spec is up to it. Alternatively play on your computer.

game cube game boy player lets you play game boy and game boy advance games on your television which is BIG.