SAV Files

How do I extract the complete game inc the sav file so the game will play on my DS :-[

So you mean when you download a game there's no Sav files ?
It's normal.You need a file with the extension .nds to play it on the DS.Though honestly, I'm confused about what do you want to ask.

Your flashcart will create the save file itself.What exactly are you trying to do? Create a backup of a real game cartridge that you can play on a flashcart?

the .sav is your saved game

if its a normal ds game that your trying to dump but havent played before its normal and if you download it from anywhere else its also normal you just need an emlator to run the game and the emulator will create it or like he said the flash cart will create it