Please do not discuss DS piracy on DCEmu.
Regardless, GBA files will not launch on the R4 or any other slot-1 device. You can get the additional EZ-V 3in1 expansion pack in addition to the R4 if you have a DS Lite, using software on the DS itself to write GBA binaries to the expansion pack and launch them.
NES emulation can be done via NES DS, which works on the R4. See the NES DS article on http://wiki.pocketheaven.com for details.
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