There isn't any way to verify the seed on carts is there?
And yes I do have the code, just a little confused on how to apply it...
X C-Gear seed gives you Y MTIVRNG value. It won't be the same as the C-Gear seed, but that seed will always give you that same value. If you have a frame of 3, don't bother using it. It just saves you some time when you have to advance the frame. It will quickly let you know whether you hit your seed or not before you start advancing the frame.
To check what seed you really hit, you have to catch a wild Pokémon and input its IVs into the "Seed to time" thingy. I don't know about gamecarts, but using a flashcart in conjunction with ToastPlusOne's timer usually yields a calibration of -330 ish.
So I recommend writing down the MTIVRNG value each time you try to hit your C-Gear seed, then catch a wild Pokémon to see what delay you really hit. Then every time you see that MTIVRNG value, you'll know that you hit that one delay.