Yo! I just wait at different times and see what gives me the right IVs. I play Pokemon B/W on a flashcart if you're wondering. I watch my analog clock closely. I'm used to using an analog clock when RNG abusing. I never used Pikatimer or the likes. Probably the reason why I can hit my seed almost 100% of the time.
By the way, sometimes my seed is different when using different parents. But since I hit my seed all the time, therefore hitting the right PID, I just wait for frame advancements.