Any way to play Gameboy games on DS?

[Niwi]

This ^

 

[Sousanator]

The only way is to get a Flashcard and put the Lameboy or nesDS emulators on it. Then put whatever Gameboy/Color games you want on it.

 

[JMM]

Or you can buy a GBC/GBA and do it, they're ridiculously cheap now.

 

[FuzzyMike]

You should buy a flashcard, copy a emulator to it and you are done.
Enjoy your gba games on your Ds!