How (or can we) play gameboy games on DS

My son has a nintendo DS with the R4.
There are a couple of games that are only available (for download) in the older gameboy format. (Land before time, The Polar express, etc)
Is there a way for these gameboy games to be played on the DS via the R4?
I think I have tried everything and I can't get it to work.Thanks in advance

You cannot do that without buying extra equipment. You need a slot 2 flash cart. (slot 2 is the slot for GBA carts and slot 1 the one for DS carts)

Nope...But (not sure if r4 has this ability) if you have an ezy 3 in 1 flash card (gba slot device-acts as rumble ram and gba support) you could...Really, what it does, is boot the data from the ds card (r4) and send to gba card (ezy 3 in 1).I know acekard works...but not sure if r4 could, prehaps there is a program that can make it work.Though those games you mentioned might be better on ds if a ds version is avaible, I have an alternate suggestion....get a gba emulator for pc.BUT wait for more users to spot this-it may be able to work-just wait and see :)

Thanks
For the responses....
So it looks like I need to buy a slot 2 flash cart....
Any suggestions on where to get this?

Ebay is one suggestion, another is to just type that into google and find some retailers...If you were in aus I would give you the name of a mod shop that sells this card.

GBAtemp.net has some good affiliates.

do you mean gameboy or GBA? i just tried to play gameboy/gbcolour using emulator with my ds, and it works. but if you mean GBA you have to use ezy 3 in 1

Replying to #7

Judgeing by the game titles based on a movie from last year-he needs the slot 2 device :)

He didn't mention movies from last year... there is a good chance one or both of them is on Gameboy Color, in that case you should use a homebrew called Lameboy DS.
http://lameboy.nutki.com/

Replying to #9

https://www.romulation.org/GBA/1862_-_Land_Before_Time,_The_%28U%29_%28M2%29.rar.html/
https://www.romulation.org/GBA/1754_-_Polar_Express,_The_%28UE%29_%28M5%29.rar.html/Both are GBA games :)

ok... nevermind then, I assumed they were on Gameboy color since he said older gameboy format