you really cant be serious in believing that any of those consoles can be emulated on ds. firstly like it or loathe it the psp is much more powerful than the ds and before you think I am a sony fanboy or something it should be noted that I own and love both.
emulating a mips r4000 at 333mhz on a couple of low clocked arm cpu's is laughable.
as for the jaguar well on the pc jag emulation requires around 2ghz of proccessing power to run full speed.
and well the sony playstation. lets see now. the psx if memory serves me right was capable of around 200 000 realtime polygons per second and the ds is only capable of around 120 000. in comparisson the psp is estimated at around 12 000 000 and xbox around 75 000 000.
also the ds only has 656k of video ram while the psx had a full megabyte.
sorry to burst your bubble but 1timeuser was correct.
maybe you could hope for a decent nes emu on the ds one day as I doubt you will be seeing much more than that emulated.