The odds of getting one with good IVs through SR'ing is very, very low. Your best bet would be either SR'ing it in Omega Ruby or doing
RNG abuse for the Palkia, though RNG abuse does require RNG Reporter on your computer, but you only use that to see when you need to hit button presses and such to get a desired IV Spread and nature.
Edit: to clarify: the Palkia in Pearl has completely random IVs that theoretically range from 0/0/0/0/0/0 to 31/31/31/31/31/31, while the Palkia in OR has 3 IVs that are guaranteed to be 31's, so the odds of getting a good Palkia from SR'ing in OR is much much higher.