I'm glad you asked :) because yes there is; you want a HP IV of 19 or less--that yields 19 HP at lv 5, meaning you only take 4 HP damage from SR upon switchin, instead of 5 with a 31 IV (which gives 20 HP, divisible by 4, you die on the 4th switchin to SR :[ )
Hope that helps, and good luck with your BP ^^
Hope that helps, and good luck with your BP ^^