Jav

Alright I have a small question. I have a legit heartgold and a downloaded Platinum on my r4. I caught a ponyta in my heartgold and all I want to do is make it shiny. So I transfered it to the platinum and opened it with Pokesav. How do I set it to shiny? Do I just have to keep generating codes in the PID/IV generator until I get a shiny code?