No, there is not. The NDS itself is not powerful enough to emulate the GBA. You need a Slot 2 card to play GBA games on your R4 SDHC. There are flashcarts with added hardware that can run GBA emulators though. iPlayer can, but cannot play NDS games. Supercard DS two will be able to, but isn't available yet.
is that Ez Flash 3in1 still selling in stores? i can't find it every else. and by the way, how to play GBA on newer ds like DSi and above? i only own a NDSlite, i just want to know.
get a ds iplayer nd then you can play gba games on a ds/dsl/dsi and then you can just use a iedge or something to play nds games
buy an iPlayer BUT remember that it cant play NDS ROMs. Or wait for the SUPERCARD DSTWO which will allow GBA Emulation and can play Backup ROMs