Hi,
You should use eg the USB Multilink or the Cyclone Pro from P&E.
There is ofcourse the DEMOAC board, but it is not designed to burn any MCU outside the board.
Put a 8 pin connector on your board, pinout see Figure 15-1 in MC9S08AC16 manual and connect the Flash burner.
It is as simple as that!
If you want to burn the Flash by some other port, you must first burn the initial program that will burn the final program. (Don't do it!)
Regards,
Ake