A stat calculator like Serebii's would be so useful in figuring this out.if your running the sub/salac reversal set on an anger point adamant primeape, what is the base HP IV desired in order to reach 1HP after fours subs? even or odd number?
Anyway, to reach 1 HP after 4 Subs, Primeape's maximum HP must be a number divisible by 4--plus 1. (Example: 301)
Since Primeape's base HP is 65, a 31 HP IV yields a maximum HP of 271. 270 is not divisible by 4, but 268 is. Therefore, the best HP value for that Primeape would be 269; a 29 HP IV would yield 269.
tl;dr version: You're looking for one of the following HP IVs: 1, 5, 9, 13, 17, 21, 25, 29.
EDIT @ JRT: I suppose a CurseLord would make great use of a Sassy nature. Speed seems inconsequential since Curse lowers it, and with the Physical side being boosted, a nature boosting the Special side just makes sense; the analysis does recommend a Careful nature for the Curse set, after all.