Originally Posted by Fat Fire Blast
I've noticed that some pokemon have their HP IV lowered so that Substitue is better.
What benefit do they get from doing that?
What are they trying to change it to? (I.e do they want it to be even or odd, or do they want it to be a certain number)
Depends on which Pokemon you're talking about and what set they are trying to pull off. I don't think I've seen any Pokemon that lower their IV's (mostly just EVs) for Substitute, I've usually only seen it for Life Orb.
For LO they want 19 HP total Stat (not IV) because the way Pokemon calculates Life Orb recoil is round down to the closest 10%, which in a pokemon with 19 HP's case is 1.
For Substitute, an odd numbered total stat hp (not IV) give you a possibility of Five total substitutes at full health, while an even number only gives you the possibility of Four.
I think the HP lowering you're talking about could be for Leech Seed. Leech Seed HP IV lowering is just so you get more overall hp recovered from your opponent so you could have the possibility of healing enough hp to be able to use Substitute again, effectively stalling out your opponent with Leech Seed damage.