FYI, There are two types of Flashcards, Slot-1 (e.g. R4DS, M3 Simply) and Slot-2 (M3, Supercard Mini-SD, Lite), and as far as I know Slot-1's only can run DS Roms and DS homebrew, and not GBA games.

Buy the cartridge la. Support original...already know the tone of this forum still have to ask..

Since you are going that way, here's a step by step method to calculating how many "ahem" games that you can fit into a 2GB micro SD card...and these set of steps are a personal favourite of mine:

i. Go to google.com
ii. Search for you "ahem" games. Let me help you with one of the keywords: ROM
iii. Once you find the game that you like...download it!
iv. Once downloaded, don't forget to uncompress it, they are usually available on the Net as .Zip or Rar files to save on download time.
v. Right click the ahem game file (it ends with the extension .nds) and click on Properties.
vi. What do you know...the size is stated on the Properties page!
vii. Now...do the math! Remember...not all ahem games come in the same size!

I think you should have noticed from the start that talk about pirated games is not allowed, and since you had the common sense to remove your earlier post, do try to find out more about "the web of ahem games" somewhere else. Google will be your best friend when it comes to that... here's the link -> www.google.com