Transfer Pokemon From Computer To Ds DSi Flash Drive Pokemon Question?

DSi Flash Drive Pokemon Question? - transfer pokemon from computer to ds

I'm loooking to buy a flash. I trained my Pokemon Diamond Diamond on my computer) (I want for my DS and Pokemon from the flash card for my regular game transfer. I did this once before a flash my DS Lite back to Diamond, when for the first time. It was a little buggy, but it worked. This option is always available, and if so, how smart do you recommend? Thank you!