Buying the original one has its benefits though :P
I never tried RNG abuse in a flash cart, but I am sure that the only thing affected is your 1st timer. If you can determine when to load the game from the DSTTi menu, you'll be able to RNG Abuse much.
Oh, no wonder. I thought you were using a retail HG game. If you're using a flash cart, there should be slight adjustments. I'm using a retail SS and PT game on a DSi XL that's why my calibrated delays are 432 and 544 respectively.