how do you play retro gameboy on r4?

hi does anybody know if you can play retro game boy games eg pokemon blue/yellow ect on the ds ive got a r4 and an ez flash 3 in 1 and have downloaded gba games using expantion tool ect and they work fine any ideas thanks in advance julie

Yes, you need a GB/GBC emulator for the DS. And you don't need the ez flash for this. Look for lameboy. It's a good emulator.

works great thanks again